diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index 6c0319984..84b759e09 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -236,6 +236,7 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
         { { { "d", "dir" }, "Use a custom path as application root (use '.' for current directory)", "directory" },
           { { "l", "launch" }, "Launch the specified instance (by instance ID)", "instance" },
           { { "s", "server" }, "Join the specified server on launch (only valid in combination with --launch)", "address" },
+          { { "w", "world" }, "Join the specified world on launch (only valid in combination with --launch)", "world" },
           { { "a", "profile" }, "Use the account specified by its profile name (only valid in combination with --launch)", "profile" },
           { "alive", "Write a small '" + liveCheckFile + "' file after the launcher starts" },
           { { "I", "import" }, "Import instance or resource from specified local path or URL", "url" },
@@ -249,7 +250,8 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
     parser.process(arguments());
 
     m_instanceIdToLaunch = parser.value("launch");
-    m_serverToJoin = parser.value("server");
+    m_server_to_join = parser.value("server");
+    m_world_to_join = parser.value("world");
     m_profileToUse = parser.value("profile");
     m_liveCheck = parser.isSet("alive");
 
@@ -265,7 +267,7 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
     }
 
     // error if --launch is missing with --server or --profile
-    if ((!m_serverToJoin.isEmpty() || !m_profileToUse.isEmpty()) && m_instanceIdToLaunch.isEmpty()) {
+    if (((!m_server_to_join.isEmpty() || !m_world_to_join.isEmpty()) || !m_profileToUse.isEmpty()) && m_instanceIdToLaunch.isEmpty()) {
         std::cerr << "--server and --profile can only be used in combination with --launch!" << std::endl;
         m_status = Application::Failed;
         return;
@@ -383,8 +385,10 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
                 launch.command = "launch";
                 launch.args["id"] = m_instanceIdToLaunch;
 
-                if (!m_serverToJoin.isEmpty()) {
-                    launch.args["server"] = m_serverToJoin;
+                if (!m_server_to_join.isEmpty()) {
+                    launch.args["server"] = m_server_to_join;
+                } else if (!m_world_to_join.isEmpty()) {
+                    launch.args["world"] = m_world_to_join;
                 }
                 if (!m_profileToUse.isEmpty()) {
                     launch.args["profile"] = m_profileToUse;
@@ -521,8 +525,10 @@ Application::Application(int& argc, char** argv) : QApplication(argc, argv)
         if (!m_instanceIdToLaunch.isEmpty()) {
             qDebug() << "ID of instance to launch   : " << m_instanceIdToLaunch;
         }
-        if (!m_serverToJoin.isEmpty()) {
-            qDebug() << "Address of server to join  :" << m_serverToJoin;
+        if (!m_server_to_join.isEmpty()) {
+            qDebug() << "Address of server to join  :" << m_server_to_join;
+        } else if (!m_world_to_join.isEmpty()) {
+            qDebug() << "Name of the world to join  :" << m_world_to_join;
         }
         qDebug() << "<> Paths set.";
     }
@@ -1157,14 +1163,17 @@ void Application::performMainStartupAction()
     if (!m_instanceIdToLaunch.isEmpty()) {
         auto inst = instances()->getInstanceById(m_instanceIdToLaunch);
         if (inst) {
-            MinecraftServerTargetPtr serverToJoin = nullptr;
+            MinecraftTarget::Ptr targetToJoin = nullptr;
             MinecraftAccountPtr accountToUse = nullptr;
 
             qDebug() << "<> Instance" << m_instanceIdToLaunch << "launching";
-            if (!m_serverToJoin.isEmpty()) {
+            if (!m_server_to_join.isEmpty()) {
                 // FIXME: validate the server string
-                serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(m_serverToJoin)));
-                qDebug() << "   Launching with server" << m_serverToJoin;
+                targetToJoin.reset(new MinecraftTarget(MinecraftTarget::parse(m_server_to_join, false)));
+                qDebug() << "   Launching with server" << m_server_to_join;
+            } else if (!m_world_to_join.isEmpty()) {
+                targetToJoin.reset(new MinecraftTarget(MinecraftTarget::parse(m_world_to_join, true)));
+                qDebug() << "   Launching with world" << m_world_to_join;
             }
 
             if (!m_profileToUse.isEmpty()) {
@@ -1175,7 +1184,7 @@ void Application::performMainStartupAction()
                 qDebug() << "   Launching with account" << m_profileToUse;
             }
 
-            launch(inst, true, false, serverToJoin, accountToUse);
+            launch(inst, true, false, targetToJoin, accountToUse);
             return;
         }
     }
@@ -1265,6 +1274,7 @@ void Application::messageReceived(const QByteArray& message)
     } else if (command == "launch") {
         QString id = received.args["id"];
         QString server = received.args["server"];
+        QString world = received.args["world"];
         QString profile = received.args["profile"];
 
         InstancePtr instance;
@@ -1279,11 +1289,12 @@ void Application::messageReceived(const QByteArray& message)
             return;
         }
 
-        MinecraftServerTargetPtr serverObject = nullptr;
+        MinecraftTarget::Ptr serverObject = nullptr;
         if (!server.isEmpty()) {
-            serverObject = std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(server));
+            serverObject = std::make_shared<MinecraftTarget>(MinecraftTarget::parse(server, false));
+        } else if (!world.isEmpty()) {
+            serverObject = std::make_shared<MinecraftTarget>(MinecraftTarget::parse(world, true));
         }
-
         MinecraftAccountPtr accountObject;
         if (!profile.isEmpty()) {
             accountObject = accounts()->getAccountByProfileName(profile);
@@ -1332,11 +1343,7 @@ bool Application::openJsonEditor(const QString& filename)
     }
 }
 
-bool Application::launch(InstancePtr instance,
-                         bool online,
-                         bool demo,
-                         MinecraftServerTargetPtr serverToJoin,
-                         MinecraftAccountPtr accountToUse)
+bool Application::launch(InstancePtr instance, bool online, bool demo, MinecraftTarget::Ptr targetToJoin, MinecraftAccountPtr accountToUse)
 {
     if (m_updateRunning) {
         qDebug() << "Cannot launch instances while an update is running. Please try again when updates are completed.";
@@ -1354,7 +1361,7 @@ bool Application::launch(InstancePtr instance,
         controller->setOnline(online);
         controller->setDemo(demo);
         controller->setProfiler(profilers().value(instance->settings()->get("Profiler").toString(), nullptr).get());
-        controller->setServerToJoin(serverToJoin);
+        controller->setTargetToJoin(targetToJoin);
         controller->setAccountToUse(accountToUse);
         if (window) {
             controller->setParentWidget(window);
diff --git a/launcher/Application.h b/launcher/Application.h
index 8303c7475..fb54b1005 100644
--- a/launcher/Application.h
+++ b/launcher/Application.h
@@ -47,7 +47,7 @@
 
 #include <BaseInstance.h>
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 
 class LaunchController;
 class LocalPeer;
@@ -202,7 +202,7 @@ class Application : public QApplication {
     bool launch(InstancePtr instance,
                 bool online = true,
                 bool demo = false,
-                MinecraftServerTargetPtr serverToJoin = nullptr,
+                MinecraftTarget::Ptr targetToJoin = nullptr,
                 MinecraftAccountPtr accountToUse = nullptr);
     bool kill(InstancePtr instance);
     void closeCurrentWindow();
@@ -289,7 +289,8 @@ class Application : public QApplication {
     QString m_detectedGLFWPath;
     QString m_detectedOpenALPath;
     QString m_instanceIdToLaunch;
-    QString m_serverToJoin;
+    QString m_server_to_join;
+    QString m_world_to_join;
     QString m_profileToUse;
     bool m_liveCheck = false;
     QList<QUrl> m_urlsToImport;
diff --git a/launcher/BaseInstance.h b/launcher/BaseInstance.h
index 499ec7866..8c80331bc 100644
--- a/launcher/BaseInstance.h
+++ b/launcher/BaseInstance.h
@@ -56,7 +56,7 @@
 #include "net/Mode.h"
 
 #include "RuntimeContext.h"
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 
 class QDir;
 class Task;
@@ -184,7 +184,7 @@ class BaseInstance : public QObject, public std::enable_shared_from_this<BaseIns
     virtual Task::Ptr createUpdateTask(Net::Mode mode) = 0;
 
     /// returns a valid launcher (task container)
-    virtual shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) = 0;
+    virtual shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, MinecraftTarget::Ptr targetToJoin) = 0;
 
     /// returns the current launch task (if any)
     shared_qobject_ptr<LaunchTask> getLaunchTask();
@@ -256,7 +256,7 @@ class BaseInstance : public QObject, public std::enable_shared_from_this<BaseIns
     /**
      * 'print' a verbose description of the instance into a QStringList
      */
-    virtual QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) = 0;
+    virtual QStringList verboseDescription(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin) = 0;
 
     Status currentStatus() const;
 
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 0208c5ec3..719af84e6 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -262,8 +262,8 @@ set(MINECRAFT_SOURCES
     minecraft/launch/ExtractNatives.h
     minecraft/launch/LauncherPartLaunch.cpp
     minecraft/launch/LauncherPartLaunch.h
-    minecraft/launch/MinecraftServerTarget.cpp
-    minecraft/launch/MinecraftServerTarget.h
+    minecraft/launch/MinecraftTarget.cpp
+    minecraft/launch/MinecraftTarget.h
     minecraft/launch/PrintInstanceInfo.cpp
     minecraft/launch/PrintInstanceInfo.h
     minecraft/launch/ReconstructAssets.cpp
diff --git a/launcher/InstancePageProvider.h b/launcher/InstancePageProvider.h
index 52399e912..174041f89 100644
--- a/launcher/InstancePageProvider.h
+++ b/launcher/InstancePageProvider.h
@@ -22,7 +22,7 @@ class InstancePageProvider : protected QObject, public BasePageProvider {
    public:
     explicit InstancePageProvider(InstancePtr parent) { inst = parent; }
 
-    virtual ~InstancePageProvider() {};
+    virtual ~InstancePageProvider() = default;
     virtual QList<BasePage*> getPages() override
     {
         QList<BasePage*> values;
@@ -39,7 +39,7 @@ class InstancePageProvider : protected QObject, public BasePageProvider {
         values.append(new TexturePackPage(onesix.get(), onesix->texturePackList()));
         values.append(new ShaderPackPage(onesix.get(), onesix->shaderPackList()));
         values.append(new NotesPage(onesix.get()));
-        values.append(new WorldListPage(onesix.get(), onesix->worldList()));
+        values.append(new WorldListPage(onesix, onesix->worldList()));
         values.append(new ServersPage(onesix));
         // values.append(new GameOptionsPage(onesix.get()));
         values.append(new ScreenshotsPage(FS::PathCombine(onesix->gameRoot(), "screenshots")));
diff --git a/launcher/LaunchController.cpp b/launcher/LaunchController.cpp
index 3866a7672..83bf3838e 100644
--- a/launcher/LaunchController.cpp
+++ b/launcher/LaunchController.cpp
@@ -324,7 +324,7 @@ void LaunchController::launchInstance()
         return;
     }
 
-    m_launcher = m_instance->createLaunchTask(m_session, m_serverToJoin);
+    m_launcher = m_instance->createLaunchTask(m_session, m_target_to_join);
     if (!m_launcher) {
         emitFailed(tr("Couldn't instantiate a launcher."));
         return;
diff --git a/launcher/LaunchController.h b/launcher/LaunchController.h
index bc688f2ba..e620b8c62 100644
--- a/launcher/LaunchController.h
+++ b/launcher/LaunchController.h
@@ -39,7 +39,7 @@
 #include <QObject>
 
 #include "minecraft/auth/MinecraftAccount.h"
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 
 class InstanceWindow;
 class LaunchController : public Task {
@@ -48,7 +48,7 @@ class LaunchController : public Task {
     void executeTask() override;
 
     LaunchController(QObject* parent = nullptr);
-    virtual ~LaunchController() {};
+    virtual ~LaunchController() = default;
 
     void setInstance(InstancePtr instance) { m_instance = instance; }
 
@@ -62,7 +62,7 @@ class LaunchController : public Task {
 
     void setParentWidget(QWidget* widget) { m_parentWidget = widget; }
 
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin) { m_serverToJoin = std::move(serverToJoin); }
+    void setTargetToJoin(MinecraftTarget::Ptr targetToJoin) { m_target_to_join = std::move(targetToJoin); }
 
     void setAccountToUse(MinecraftAccountPtr accountToUse) { m_accountToUse = std::move(accountToUse); }
 
@@ -94,5 +94,5 @@ class LaunchController : public Task {
     MinecraftAccountPtr m_accountToUse = nullptr;
     AuthSessionPtr m_session;
     shared_qobject_ptr<LaunchTask> m_launcher;
-    MinecraftServerTargetPtr m_serverToJoin;
+    MinecraftTarget::Ptr m_target_to_join;
 };
diff --git a/launcher/NullInstance.h b/launcher/NullInstance.h
index b6a9478a8..3ee38e76c 100644
--- a/launcher/NullInstance.h
+++ b/launcher/NullInstance.h
@@ -46,13 +46,13 @@ class NullInstance : public BaseInstance {
     {
         setVersionBroken(true);
     }
-    virtual ~NullInstance() {};
+    virtual ~NullInstance() = default;
     void saveNow() override {}
     void loadSpecificSettings() override { setSpecificSettingsLoaded(true); }
     QString getStatusbarDescription() override { return tr("Unknown instance type"); };
     QSet<QString> traits() const override { return {}; };
     QString instanceConfigFolder() const override { return instanceRoot(); };
-    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr, MinecraftServerTargetPtr) override { return nullptr; }
+    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr, MinecraftTarget::Ptr) override { return nullptr; }
     shared_qobject_ptr<Task> createUpdateTask([[maybe_unused]] Net::Mode mode) override { return nullptr; }
     QProcessEnvironment createEnvironment() override { return QProcessEnvironment(); }
     QProcessEnvironment createLaunchEnvironment() override { return QProcessEnvironment(); }
@@ -64,7 +64,7 @@ class NullInstance : public BaseInstance {
     bool canEdit() const override { return false; }
     bool canLaunch() const override { return false; }
     void populateLaunchMenu(QMenu* menu) override {}
-    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override
+    QStringList verboseDescription(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin) override
     {
         QStringList out;
         out << "Null instance - placeholder.";
diff --git a/launcher/launch/steps/LookupServerAddress.cpp b/launcher/launch/steps/LookupServerAddress.cpp
index 9bdac203b..4b67b3092 100644
--- a/launcher/launch/steps/LookupServerAddress.cpp
+++ b/launcher/launch/steps/LookupServerAddress.cpp
@@ -30,7 +30,7 @@ void LookupServerAddress::setLookupAddress(const QString& lookupAddress)
     m_dnsLookup->setName(QString("_minecraft._tcp.%1").arg(lookupAddress));
 }
 
-void LookupServerAddress::setOutputAddressPtr(MinecraftServerTargetPtr output)
+void LookupServerAddress::setOutputAddressPtr(MinecraftTarget::Ptr output)
 {
     m_output = std::move(output);
 }
diff --git a/launcher/launch/steps/LookupServerAddress.h b/launcher/launch/steps/LookupServerAddress.h
index acbd74309..506314ee8 100644
--- a/launcher/launch/steps/LookupServerAddress.h
+++ b/launcher/launch/steps/LookupServerAddress.h
@@ -19,20 +19,20 @@
 #include <launch/LaunchStep.h>
 #include <QDnsLookup>
 
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 
 class LookupServerAddress : public LaunchStep {
     Q_OBJECT
    public:
     explicit LookupServerAddress(LaunchTask* parent);
-    virtual ~LookupServerAddress() {};
+    virtual ~LookupServerAddress() = default;
 
     virtual void executeTask();
     virtual bool abort();
     virtual bool canAbort() const { return true; }
 
     void setLookupAddress(const QString& lookupAddress);
-    void setOutputAddressPtr(MinecraftServerTargetPtr output);
+    void setOutputAddressPtr(MinecraftTarget::Ptr output);
 
    private slots:
     void on_dnsLookupFinished();
@@ -42,5 +42,5 @@ class LookupServerAddress : public LaunchStep {
 
     QDnsLookup* m_dnsLookup;
     QString m_lookupAddress;
-    MinecraftServerTargetPtr m_output;
+    MinecraftTarget::Ptr m_output;
 };
diff --git a/launcher/minecraft/MinecraftInstance.cpp b/launcher/minecraft/MinecraftInstance.cpp
index d119104fe..c50d57513 100644
--- a/launcher/minecraft/MinecraftInstance.cpp
+++ b/launcher/minecraft/MinecraftInstance.cpp
@@ -196,8 +196,9 @@ void MinecraftInstance::loadSpecificSettings()
     }
 
     // Join server on launch, this does not have a global override
-    m_settings->registerSetting("JoinServerOnLaunch", false);
+    m_settings->registerSetting({ "JoinServerOnLaunch", "JoinOnLaunch" }, false);
     m_settings->registerSetting("JoinServerOnLaunchAddress", "");
+    m_settings->registerSetting("JoinWorldOnLaunch", "");
 
     // Use account for instance, this does not have a global override
     m_settings->registerSetting("UseAccountForInstance", false);
@@ -523,8 +524,7 @@ QStringList MinecraftInstance::javaArguments()
 
     if (javaVersion.isModular() && shouldApplyOnlineFixes())
         // allow reflective access to java.net - required by the skin fix
-        args << "--add-opens"
-             << "java.base/java.net=ALL-UNNAMED";
+        args << "--add-opens" << "java.base/java.net=ALL-UNNAMED";
 
     return args;
 }
@@ -656,7 +656,7 @@ static QString replaceTokensIn(QString text, QMap<QString, QString> with)
     return result;
 }
 
-QStringList MinecraftInstance::processMinecraftArgs(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) const
+QStringList MinecraftInstance::processMinecraftArgs(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin) const
 {
     auto profile = m_components->getProfile();
     QString args_pattern = profile->getMinecraftArguments();
@@ -664,12 +664,16 @@ QStringList MinecraftInstance::processMinecraftArgs(AuthSessionPtr session, Mine
         args_pattern += " --tweakClass " + tweaker;
     }
 
-    if (serverToJoin && !serverToJoin->address.isEmpty()) {
-        if (profile->hasTrait("feature:is_quick_play_multiplayer")) {
-            args_pattern += " --quickPlayMultiplayer " + serverToJoin->address + ':' + QString::number(serverToJoin->port);
-        } else {
-            args_pattern += " --server " + serverToJoin->address;
-            args_pattern += " --port " + QString::number(serverToJoin->port);
+    if (targetToJoin) {
+        if (!targetToJoin->address.isEmpty()) {
+            if (profile->hasTrait("feature:is_quick_play_multiplayer")) {
+                args_pattern += " --quickPlayMultiplayer " + targetToJoin->address + ':' + QString::number(targetToJoin->port);
+            } else {
+                args_pattern += " --server " + targetToJoin->address;
+                args_pattern += " --port " + QString::number(targetToJoin->port);
+            }
+        } else if (!targetToJoin->world.isEmpty() && profile->hasTrait("feature:is_quick_play_singleplayer")) {
+            args_pattern += " --quickPlaySingleplayer " + targetToJoin->world;
         }
     }
 
@@ -713,7 +717,7 @@ QStringList MinecraftInstance::processMinecraftArgs(AuthSessionPtr session, Mine
     return parts;
 }
 
-QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin)
 {
     QString launchScript;
 
@@ -732,9 +736,13 @@ QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftS
         launchScript += "appletClass " + appletClass + "\n";
     }
 
-    if (serverToJoin && !serverToJoin->address.isEmpty()) {
-        launchScript += "serverAddress " + serverToJoin->address + "\n";
-        launchScript += "serverPort " + QString::number(serverToJoin->port) + "\n";
+    if (targetToJoin) {
+        if (!targetToJoin->address.isEmpty()) {
+            launchScript += "serverAddress " + targetToJoin->address + "\n";
+            launchScript += "serverPort " + QString::number(targetToJoin->port) + "\n";
+        } else if (!targetToJoin->world.isEmpty()) {
+            launchScript += "worldName " + targetToJoin->world + "\n";
+        }
     }
 
     // generic minecraft params
@@ -787,13 +795,11 @@ QString MinecraftInstance::createLaunchScript(AuthSessionPtr session, MinecraftS
     return launchScript;
 }
 
-QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin)
 {
     QStringList out;
-    out << "Main Class:"
-        << "  " + getMainClass() << "";
-    out << "Native path:"
-        << "  " + getNativePath() << "";
+    out << "Main Class:" << "  " + getMainClass() << "";
+    out << "Native path:" << "  " + getNativePath() << "";
 
     auto profile = m_components->getProfile();
 
@@ -884,7 +890,7 @@ QStringList MinecraftInstance::verboseDescription(AuthSessionPtr session, Minecr
         out << "";
     }
 
-    auto params = processMinecraftArgs(nullptr, serverToJoin);
+    auto params = processMinecraftArgs(nullptr, targetToJoin);
     out << "Params:";
     out << "  " + params.join(' ');
     out << "";
@@ -1034,7 +1040,7 @@ Task::Ptr MinecraftInstance::createUpdateTask(Net::Mode mode)
     return nullptr;
 }
 
-shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin)
 {
     updateRuntimeContext();
     // FIXME: get rid of shared_from_this ...
@@ -1058,16 +1064,23 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
         process->appendStep(makeShared<CreateGameFolders>(pptr));
     }
 
-    if (!serverToJoin && settings()->get("JoinServerOnLaunch").toBool()) {
+    if (!targetToJoin && settings()->get("JoinOnLaunch").toBool()) {
         QString fullAddress = settings()->get("JoinServerOnLaunchAddress").toString();
-        serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(fullAddress)));
+        if (!fullAddress.isEmpty()) {
+            targetToJoin.reset(new MinecraftTarget(MinecraftTarget::parse(fullAddress, false)));
+        } else {
+            QString world = settings()->get("JoinWorldOnLaunch").toString();
+            if (!world.isEmpty()) {
+                targetToJoin.reset(new MinecraftTarget(MinecraftTarget::parse(world, true)));
+            }
+        }
     }
 
-    if (serverToJoin && serverToJoin->port == 25565) {
+    if (targetToJoin && targetToJoin->port == 25565) {
         // Resolve server address to join on launch
         auto step = makeShared<LookupServerAddress>(pptr);
-        step->setLookupAddress(serverToJoin->address);
-        step->setOutputAddressPtr(serverToJoin);
+        step->setLookupAddress(targetToJoin->address);
+        step->setOutputAddressPtr(targetToJoin);
         process->appendStep(step);
     }
 
@@ -1100,7 +1113,7 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
 
     // print some instance info here...
     {
-        process->appendStep(makeShared<PrintInstanceInfo>(pptr, session, serverToJoin));
+        process->appendStep(makeShared<PrintInstanceInfo>(pptr, session, targetToJoin));
     }
 
     // extract native jars if needed
@@ -1123,7 +1136,7 @@ shared_qobject_ptr<LaunchTask> MinecraftInstance::createLaunchTask(AuthSessionPt
         auto step = makeShared<LauncherPartLaunch>(pptr);
         step->setWorkingDirectory(gameRoot());
         step->setAuthSession(session);
-        step->setServerToJoin(serverToJoin);
+        step->setTargetToJoin(targetToJoin);
         process->appendStep(step);
     }
 
diff --git a/launcher/minecraft/MinecraftInstance.h b/launcher/minecraft/MinecraftInstance.h
index 7af0df389..ad2cda186 100644
--- a/launcher/minecraft/MinecraftInstance.h
+++ b/launcher/minecraft/MinecraftInstance.h
@@ -39,7 +39,7 @@
 #include <QDir>
 #include <QProcess>
 #include "BaseInstance.h"
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 #include "minecraft/mod/Mod.h"
 
 class ModFolderModel;
@@ -56,7 +56,7 @@ class MinecraftInstance : public BaseInstance {
     Q_OBJECT
    public:
     MinecraftInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString& rootDir);
-    virtual ~MinecraftInstance() {};
+    virtual ~MinecraftInstance() = default;
     virtual void saveNow() override;
 
     void loadSpecificSettings() override;
@@ -121,11 +121,11 @@ class MinecraftInstance : public BaseInstance {
 
     //////  Launch stuff //////
     Task::Ptr createUpdateTask(Net::Mode mode) override;
-    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) override;
+    shared_qobject_ptr<LaunchTask> createLaunchTask(AuthSessionPtr account, MinecraftTarget::Ptr targetToJoin) override;
     QStringList extraArguments() override;
-    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override;
+    QStringList verboseDescription(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin) override;
     QList<Mod*> getJarMods() const;
-    QString createLaunchScript(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin);
+    QString createLaunchScript(AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin);
     /// get arguments passed to java
     QStringList javaArguments();
     QString getLauncher();
@@ -155,7 +155,7 @@ class MinecraftInstance : public BaseInstance {
     virtual QString getMainClass() const;
 
     // FIXME: remove
-    virtual QStringList processMinecraftArgs(AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) const;
+    virtual QStringList processMinecraftArgs(AuthSessionPtr account, MinecraftTarget::Ptr targetToJoin) const;
 
     virtual JavaVersion getJavaVersion();
 
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.cpp b/launcher/minecraft/launch/LauncherPartLaunch.cpp
index b35d55924..be1bde464 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.cpp
+++ b/launcher/minecraft/launch/LauncherPartLaunch.cpp
@@ -90,7 +90,7 @@ void LauncherPartLaunch::executeTask()
         }
     }
 
-    m_launchScript = minecraftInstance->createLaunchScript(m_session, m_serverToJoin);
+    m_launchScript = minecraftInstance->createLaunchScript(m_session, m_target_to_join);
     QStringList args = minecraftInstance->javaArguments();
     QString allArgs = args.join(", ");
     emit logLine("Java Arguments:\n[" + m_parent->censorPrivateInfo(allArgs) + "]\n\n", MessageLevel::Launcher);
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.h b/launcher/minecraft/launch/LauncherPartLaunch.h
index fcd4daec6..ca0906550 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.h
+++ b/launcher/minecraft/launch/LauncherPartLaunch.h
@@ -19,13 +19,13 @@
 #include <launch/LaunchStep.h>
 #include <minecraft/auth/AuthSession.h>
 
-#include "MinecraftServerTarget.h"
+#include "MinecraftTarget.h"
 
 class LauncherPartLaunch : public LaunchStep {
     Q_OBJECT
    public:
     explicit LauncherPartLaunch(LaunchTask* parent);
-    virtual ~LauncherPartLaunch() {};
+    virtual ~LauncherPartLaunch() = default;
 
     virtual void executeTask();
     virtual bool abort();
@@ -34,7 +34,7 @@ class LauncherPartLaunch : public LaunchStep {
     void setWorkingDirectory(const QString& wd);
     void setAuthSession(AuthSessionPtr session) { m_session = session; }
 
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin) { m_serverToJoin = std::move(serverToJoin); }
+    void setTargetToJoin(MinecraftTarget::Ptr targetToJoin) { m_target_to_join = std::move(targetToJoin); }
 
    private slots:
     void on_state(LoggedProcess::State state);
@@ -44,7 +44,7 @@ class LauncherPartLaunch : public LaunchStep {
     QString m_command;
     AuthSessionPtr m_session;
     QString m_launchScript;
-    MinecraftServerTargetPtr m_serverToJoin;
+    MinecraftTarget::Ptr m_target_to_join;
 
     bool mayProceed = false;
 };
diff --git a/launcher/minecraft/launch/MinecraftServerTarget.cpp b/launcher/minecraft/launch/MinecraftTarget.cpp
similarity index 86%
rename from launcher/minecraft/launch/MinecraftServerTarget.cpp
rename to launcher/minecraft/launch/MinecraftTarget.cpp
index e201efab1..ba9f87511 100644
--- a/launcher/minecraft/launch/MinecraftServerTarget.cpp
+++ b/launcher/minecraft/launch/MinecraftTarget.cpp
@@ -13,13 +13,18 @@
  * limitations under the License.
  */
 
-#include "MinecraftServerTarget.h"
+#include "MinecraftTarget.h"
 
 #include <QStringList>
 
 // FIXME: the way this is written, it can't ever do any sort of validation and can accept total junk
-MinecraftServerTarget MinecraftServerTarget::parse(const QString& fullAddress)
+MinecraftTarget MinecraftTarget::parse(const QString& fullAddress, bool useWorld)
 {
+    if (useWorld) {
+        MinecraftTarget target;
+        target.world = fullAddress;
+        return target;
+    }
     QStringList split = fullAddress.split(":");
 
     // The logic below replicates the exact logic minecraft uses for parsing server addresses.
@@ -56,5 +61,5 @@ MinecraftServerTarget MinecraftServerTarget::parse(const QString& fullAddress)
         }
     }
 
-    return MinecraftServerTarget{ realAddress, realPort };
+    return MinecraftTarget{ realAddress, realPort };
 }
diff --git a/launcher/minecraft/launch/MinecraftServerTarget.h b/launcher/minecraft/launch/MinecraftTarget.h
similarity index 80%
rename from launcher/minecraft/launch/MinecraftServerTarget.h
rename to launcher/minecraft/launch/MinecraftTarget.h
index 2edd8a30d..7f8b268d9 100644
--- a/launcher/minecraft/launch/MinecraftServerTarget.h
+++ b/launcher/minecraft/launch/MinecraftTarget.h
@@ -19,11 +19,11 @@
 
 #include <QString>
 
-struct MinecraftServerTarget {
+struct MinecraftTarget {
     QString address;
     quint16 port;
 
-    static MinecraftServerTarget parse(const QString& fullAddress);
+    QString world;
+    static MinecraftTarget parse(const QString& fullAddress, bool useWorld);
+    using Ptr = std::shared_ptr<MinecraftTarget>;
 };
-
-using MinecraftServerTargetPtr = std::shared_ptr<MinecraftServerTarget>;
diff --git a/launcher/minecraft/launch/PrintInstanceInfo.cpp b/launcher/minecraft/launch/PrintInstanceInfo.cpp
index e3a45b030..78cb26378 100644
--- a/launcher/minecraft/launch/PrintInstanceInfo.cpp
+++ b/launcher/minecraft/launch/PrintInstanceInfo.cpp
@@ -129,6 +129,6 @@ void PrintInstanceInfo::executeTask()
 #endif
 
     logLines(log, MessageLevel::Launcher);
-    logLines(instance->verboseDescription(m_session, m_serverToJoin), MessageLevel::Launcher);
+    logLines(instance->verboseDescription(m_session, m_target_to_join), MessageLevel::Launcher);
     emitSucceeded();
 }
diff --git a/launcher/minecraft/launch/PrintInstanceInfo.h b/launcher/minecraft/launch/PrintInstanceInfo.h
index 93c5f0fd6..780ac5b2c 100644
--- a/launcher/minecraft/launch/PrintInstanceInfo.h
+++ b/launcher/minecraft/launch/PrintInstanceInfo.h
@@ -16,22 +16,21 @@
 #pragma once
 
 #include <launch/LaunchStep.h>
-#include <memory>
 #include "minecraft/auth/AuthSession.h"
-#include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/launch/MinecraftTarget.h"
 
 // FIXME: temporary wrapper for existing task.
 class PrintInstanceInfo : public LaunchStep {
     Q_OBJECT
    public:
-    explicit PrintInstanceInfo(LaunchTask* parent, AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
-        : LaunchStep(parent), m_session(session), m_serverToJoin(serverToJoin) {};
-    virtual ~PrintInstanceInfo() {};
+    explicit PrintInstanceInfo(LaunchTask* parent, AuthSessionPtr session, MinecraftTarget::Ptr targetToJoin)
+        : LaunchStep(parent), m_session(session), m_target_to_join(targetToJoin) {};
+    virtual ~PrintInstanceInfo() = default;
 
     virtual void executeTask();
     virtual bool canAbort() const { return false; }
 
    private:
     AuthSessionPtr m_session;
-    MinecraftServerTargetPtr m_serverToJoin;
+    MinecraftTarget::Ptr m_target_to_join;
 };
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.cpp b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
index 76add9402..a017d5e13 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.cpp
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.cpp
@@ -36,6 +36,8 @@
  */
 
 #include "InstanceSettingsPage.h"
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/WorldList.h"
 #include "ui_InstanceSettingsPage.h"
 
 #include <QDialog>
@@ -71,6 +73,22 @@ InstanceSettingsPage::InstanceSettingsPage(BaseInstance* inst, QWidget* parent)
     connect(ui->useNativeGLFWCheck, &QAbstractButton::toggled, this, &InstanceSettingsPage::onUseNativeGLFWChanged);
     connect(ui->useNativeOpenALCheck, &QAbstractButton::toggled, this, &InstanceSettingsPage::onUseNativeOpenALChanged);
 
+    auto mInst = dynamic_cast<MinecraftInstance*>(inst);
+    m_world_quickplay_supported = mInst && mInst->traits().contains("feature:is_quick_play_singleplayer");
+    if (m_world_quickplay_supported) {
+        auto worlds = mInst->worldList();
+        worlds->update();
+        for (const auto& world : worlds->allWorlds()) {
+            ui->worldsCb->addItem(world.folderName());
+        }
+    } else {
+        ui->worldsCb->hide();
+        ui->worldJoinButton->hide();
+        ui->serverJoinAddressButton->setChecked(true);
+        ui->serverJoinAddress->setEnabled(true);
+        ui->serverJoinAddressButton->setStyleSheet("QRadioButton::indicator { width: 0px; height: 0px; }");
+    }
+
     loadSettings();
 
     updateThresholds();
@@ -256,9 +274,16 @@ void InstanceSettingsPage::applySettings()
     bool joinServerOnLaunch = ui->serverJoinGroupBox->isChecked();
     m_settings->set("JoinServerOnLaunch", joinServerOnLaunch);
     if (joinServerOnLaunch) {
-        m_settings->set("JoinServerOnLaunchAddress", ui->serverJoinAddress->text());
+        if (ui->serverJoinAddressButton->isChecked() || !m_world_quickplay_supported) {
+            m_settings->set("JoinServerOnLaunchAddress", ui->serverJoinAddress->text());
+            m_settings->reset("JoinWorldOnLaunch");
+        } else {
+            m_settings->set("JoinWorldOnLaunch", ui->worldsCb->currentText());
+            m_settings->reset("JoinServerOnLaunchAddress");
+        }
     } else {
         m_settings->reset("JoinServerOnLaunchAddress");
+        m_settings->reset("JoinWorldOnLaunch");
     }
 
     // Use an account for this instance
@@ -379,7 +404,25 @@ void InstanceSettingsPage::loadSettings()
     ui->recordGameTime->setChecked(m_settings->get("RecordGameTime").toBool());
 
     ui->serverJoinGroupBox->setChecked(m_settings->get("JoinServerOnLaunch").toBool());
-    ui->serverJoinAddress->setText(m_settings->get("JoinServerOnLaunchAddress").toString());
+
+    if (auto server = m_settings->get("JoinServerOnLaunchAddress").toString(); !server.isEmpty()) {
+        ui->serverJoinAddress->setText(server);
+        ui->serverJoinAddressButton->setChecked(true);
+        ui->worldJoinButton->setChecked(false);
+        ui->serverJoinAddress->setEnabled(true);
+        ui->worldsCb->setEnabled(false);
+    } else if (auto world = m_settings->get("JoinWorldOnLaunch").toString(); !world.isEmpty() && m_world_quickplay_supported) {
+        ui->worldsCb->setCurrentText(world);
+        ui->serverJoinAddressButton->setChecked(false);
+        ui->worldJoinButton->setChecked(true);
+        ui->serverJoinAddress->setEnabled(false);
+        ui->worldsCb->setEnabled(true);
+    } else {
+        ui->serverJoinAddressButton->setChecked(true);
+        ui->worldJoinButton->setChecked(false);
+        ui->serverJoinAddress->setEnabled(true);
+        ui->worldsCb->setEnabled(false);
+    }
 
     ui->instanceAccountGroupBox->setChecked(m_settings->get("UseAccountForInstance").toBool());
     updateAccountsMenu();
@@ -534,3 +577,13 @@ void InstanceSettingsPage::updateThresholds()
         ui->labelMaxMemIcon->setPixmap(pix);
     }
 }
+
+void InstanceSettingsPage::on_serverJoinAddressButton_toggled(bool checked)
+{
+    ui->serverJoinAddress->setEnabled(checked);
+}
+
+void InstanceSettingsPage::on_worldJoinButton_toggled(bool checked)
+{
+    ui->worldsCb->setEnabled(checked);
+}
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.h b/launcher/ui/pages/instance/InstanceSettingsPage.h
index 8b78dcb7f..6364502c9 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.h
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.h
@@ -70,6 +70,8 @@ class InstanceSettingsPage : public QWidget, public BasePage {
     void on_javaTestBtn_clicked();
     void on_javaBrowseBtn_clicked();
     void on_maxMemSpinBox_valueChanged(int i);
+    void on_serverJoinAddressButton_toggled(bool checked);
+    void on_worldJoinButton_toggled(bool checked);
 
     void onUseNativeGLFWChanged(bool checked);
     void onUseNativeOpenALChanged(bool checked);
@@ -90,4 +92,5 @@ class InstanceSettingsPage : public QWidget, public BasePage {
     BaseInstance* m_instance;
     SettingsObjectPtr m_settings;
     unique_qobject_ptr<JavaCommon::TestCheck> checker;
+    bool m_world_quickplay_supported;
 };
diff --git a/launcher/ui/pages/instance/InstanceSettingsPage.ui b/launcher/ui/pages/instance/InstanceSettingsPage.ui
index 9490860ae..2f496318d 100644
--- a/launcher/ui/pages/instance/InstanceSettingsPage.ui
+++ b/launcher/ui/pages/instance/InstanceSettingsPage.ui
@@ -660,7 +660,7 @@
        <item>
         <widget class="QGroupBox" name="serverJoinGroupBox">
          <property name="title">
-          <string>Set a server to join on launch</string>
+          <string>Set a target to join on launch</string>
          </property>
          <property name="checkable">
           <bool>true</bool>
@@ -668,26 +668,26 @@
          <property name="checked">
           <bool>false</bool>
          </property>
-         <layout class="QVBoxLayout" name="verticalLayout_11">
-          <item>
-           <layout class="QGridLayout" name="serverJoinLayout">
-            <item row="0" column="0">
-             <widget class="QLabel" name="serverJoinAddressLabel">
-              <property name="sizePolicy">
-               <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
-                <horstretch>0</horstretch>
-                <verstretch>0</verstretch>
-               </sizepolicy>
-              </property>
-              <property name="text">
-               <string>Server address:</string>
-              </property>
-             </widget>
-            </item>
-            <item row="0" column="1">
-             <widget class="QLineEdit" name="serverJoinAddress"/>
-            </item>
-           </layout>
+         <layout class="QGridLayout" name="gridLayout_4">
+          <item row="0" column="0">
+           <widget class="QRadioButton" name="serverJoinAddressButton">
+            <property name="text">
+             <string>Server address:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="2">
+           <widget class="QLineEdit" name="serverJoinAddress"/>
+          </item>
+          <item row="1" column="0">
+           <widget class="QRadioButton" name="worldJoinButton">
+            <property name="text">
+             <string>Singleplayer world</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="2">
+           <widget class="QComboBox" name="worldsCb"/>
           </item>
          </layout>
         </widget>
diff --git a/launcher/ui/pages/instance/ServersPage.cpp b/launcher/ui/pages/instance/ServersPage.cpp
index f842b4b93..d8035e73e 100644
--- a/launcher/ui/pages/instance/ServersPage.cpp
+++ b/launcher/ui/pages/instance/ServersPage.cpp
@@ -168,7 +168,7 @@ class ServersModel : public QAbstractListModel {
         m_saveTimer.setInterval(5000);
         connect(&m_saveTimer, &QTimer::timeout, this, &ServersModel::save_internal);
     }
-    virtual ~ServersModel() {};
+    virtual ~ServersModel() = default;
 
     void observe()
     {
@@ -731,7 +731,7 @@ void ServersPage::on_actionMove_Down_triggered()
 void ServersPage::on_actionJoin_triggered()
 {
     const auto& address = m_model->at(currentServer)->m_address;
-    APPLICATION->launch(m_inst, true, false, std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(address)));
+    APPLICATION->launch(m_inst, true, false, std::make_shared<MinecraftTarget>(MinecraftTarget::parse(address, false)));
 }
 
 #include "ServersPage.moc"
diff --git a/launcher/ui/pages/instance/WorldListPage.cpp b/launcher/ui/pages/instance/WorldListPage.cpp
index 4f30e4bb7..548d1025e 100644
--- a/launcher/ui/pages/instance/WorldListPage.cpp
+++ b/launcher/ui/pages/instance/WorldListPage.cpp
@@ -82,7 +82,7 @@ class WorldListProxyModel : public QSortFilterProxyModel {
     }
 };
 
-WorldListPage::WorldListPage(BaseInstance* inst, std::shared_ptr<WorldList> worlds, QWidget* parent)
+WorldListPage::WorldListPage(InstancePtr inst, std::shared_ptr<WorldList> worlds, QWidget* parent)
     : QMainWindow(parent), m_inst(inst), ui(new Ui::WorldListPage), m_worlds(worlds)
 {
     ui->setupUi(this);
@@ -120,6 +120,8 @@ void WorldListPage::openedImpl()
         m_wide_bar_setting = APPLICATION->settings()->getSetting(setting_name);
 
     ui->toolBar->setVisibilityState(m_wide_bar_setting->get().toByteArray());
+    auto mInst = std::dynamic_pointer_cast<MinecraftInstance>(m_inst);
+    ui->toolBar->setActionVisible(ui->actionJoin, mInst && mInst->traits().contains("feature:is_quick_play_singleplayer"));
 }
 
 void WorldListPage::closedImpl()
@@ -339,6 +341,9 @@ void WorldListPage::worldChanged([[maybe_unused]] const QModelIndex& current, [[
     ui->actionDatapacks->setEnabled(enable);
     bool hasIcon = !index.data(WorldList::IconFileRole).isNull();
     ui->actionReset_Icon->setEnabled(enable && hasIcon);
+    auto mInst = std::dynamic_pointer_cast<MinecraftInstance>(m_inst);
+    ui->actionJoin->setEnabled(enable);
+    ui->toolBar->setActionVisible(ui->actionJoin, mInst && mInst->traits().contains("feature:is_quick_play_singleplayer"));
 }
 
 void WorldListPage::on_actionAdd_triggered()
@@ -418,4 +423,15 @@ void WorldListPage::on_actionRefresh_triggered()
     m_worlds->update();
 }
 
+void WorldListPage::on_actionJoin_triggered()
+{
+    QModelIndex index = getSelectedWorld();
+    if (!index.isValid()) {
+        return;
+    }
+    auto worldVariant = m_worlds->data(index, WorldList::ObjectRole);
+    auto world = (World*)worldVariant.value<void*>();
+    APPLICATION->launch(m_inst, true, false, std::make_shared<MinecraftTarget>(MinecraftTarget::parse(world->folderName(), true)));
+}
+
 #include "WorldListPage.moc"
diff --git a/launcher/ui/pages/instance/WorldListPage.h b/launcher/ui/pages/instance/WorldListPage.h
index 4f83002f4..84d9cd075 100644
--- a/launcher/ui/pages/instance/WorldListPage.h
+++ b/launcher/ui/pages/instance/WorldListPage.h
@@ -53,7 +53,7 @@ class WorldListPage : public QMainWindow, public BasePage {
     Q_OBJECT
 
    public:
-    explicit WorldListPage(BaseInstance* inst, std::shared_ptr<WorldList> worlds, QWidget* parent = 0);
+    explicit WorldListPage(InstancePtr inst, std::shared_ptr<WorldList> worlds, QWidget* parent = 0);
     virtual ~WorldListPage();
 
     virtual QString displayName() const override { return tr("Worlds"); }
@@ -72,7 +72,7 @@ class WorldListPage : public QMainWindow, public BasePage {
     QMenu* createPopupMenu() override;
 
    protected:
-    BaseInstance* m_inst;
+    InstancePtr m_inst;
 
    private:
     QModelIndex getSelectedWorld();
@@ -101,6 +101,7 @@ class WorldListPage : public QMainWindow, public BasePage {
     void on_actionReset_Icon_triggered();
     void worldChanged(const QModelIndex& current, const QModelIndex& previous);
     void mceditState(LoggedProcess::State state);
+    void on_actionJoin_triggered();
 
     void ShowContextMenu(const QPoint& pos);
 };
diff --git a/launcher/ui/pages/instance/WorldListPage.ui b/launcher/ui/pages/instance/WorldListPage.ui
index d74dd0796..04344b453 100644
--- a/launcher/ui/pages/instance/WorldListPage.ui
+++ b/launcher/ui/pages/instance/WorldListPage.ui
@@ -81,6 +81,7 @@
    </attribute>
    <addaction name="actionAdd"/>
    <addaction name="separator"/>
+   <addaction name="actionJoin"/>
    <addaction name="actionRename"/>
    <addaction name="actionCopy"/>
    <addaction name="actionRemove"/>
@@ -97,6 +98,11 @@
     <string>Add</string>
    </property>
   </action>
+  <action name="actionJoin">
+   <property name="text">
+    <string>Join</string>
+   </property>
+  </action>
   <action name="actionRename">
    <property name="text">
     <string>Rename</string>
diff --git a/launcher/ui/widgets/WideBar.cpp b/launcher/ui/widgets/WideBar.cpp
index 46caaaef2..455b14f69 100644
--- a/launcher/ui/widgets/WideBar.cpp
+++ b/launcher/ui/widgets/WideBar.cpp
@@ -309,4 +309,17 @@ bool WideBar::checkHash(QByteArray const& old_hash) const
     return old_hash == getHash();
 }
 
+void WideBar::setActionVisible(QAction* action, bool visible)
+{
+    auto iter = getMatching(action);
+    if (iter == m_entries.end()) {
+        return;
+    }
+
+    iter->bar_action->setVisible(visible);
+
+    // NOTE: This is needed so that disabled actions get reflected on the button when it is made visible.
+    static_cast<ActionButton*>(widgetForAction(iter->bar_action))->actionChanged();
+}
+
 #include "WideBar.moc"
diff --git a/launcher/ui/widgets/WideBar.h b/launcher/ui/widgets/WideBar.h
index c47f3a596..09480594a 100644
--- a/launcher/ui/widgets/WideBar.h
+++ b/launcher/ui/widgets/WideBar.h
@@ -38,6 +38,8 @@ class WideBar : public QToolBar {
     [[nodiscard]] QByteArray getVisibilityState() const;
     void setVisibilityState(QByteArray&&);
 
+    void setActionVisible(QAction* action, bool visible);
+
    private:
     struct BarEntry {
         enum class Type { None, Action, Separator, Spacer } type = Type::None;
diff --git a/libraries/launcher/org/prismlauncher/launcher/impl/AbstractLauncher.java b/libraries/launcher/org/prismlauncher/launcher/impl/AbstractLauncher.java
index de28a0401..a5f027ba6 100644
--- a/libraries/launcher/org/prismlauncher/launcher/impl/AbstractLauncher.java
+++ b/libraries/launcher/org/prismlauncher/launcher/impl/AbstractLauncher.java
@@ -70,7 +70,7 @@ public abstract class AbstractLauncher implements Launcher {
     // secondary parameters
     protected final int width, height;
     protected final boolean maximize;
-    protected final String serverAddress, serverPort;
+    protected final String serverAddress, serverPort, worldName;
 
     protected final String mainClassName;
 
@@ -80,6 +80,7 @@ public abstract class AbstractLauncher implements Launcher {
 
         serverAddress = params.getString("serverAddress", null);
         serverPort = params.getString("serverPort", null);
+        worldName = params.getString("worldName", null);
 
         String windowParams = params.getString("windowParams", null);
 
diff --git a/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java b/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
index 49e5d518f..dc518be64 100644
--- a/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
+++ b/libraries/launcher/org/prismlauncher/launcher/impl/StandardLauncher.java
@@ -62,13 +62,15 @@ import java.util.Collections;
 import java.util.List;
 
 public final class StandardLauncher extends AbstractLauncher {
-    private final boolean quickPlaySupported;
+    private final boolean quickPlayMultiplayerSupported;
+    private final boolean quickPlaySingleplayerSupported;
 
     public StandardLauncher(Parameters params) {
         super(params);
 
         List<String> traits = params.getList("traits", Collections.<String>emptyList());
-        quickPlaySupported = traits.contains("feature:is_quick_play_multiplayer");
+        quickPlayMultiplayerSupported = traits.contains("feature:is_quick_play_multiplayer");
+        quickPlaySingleplayerSupported = traits.contains("feature:is_quick_play_singleplayer");
     }
 
     @Override
@@ -83,7 +85,7 @@ public final class StandardLauncher extends AbstractLauncher {
         }
 
         if (serverAddress != null) {
-            if (quickPlaySupported) {
+            if (quickPlayMultiplayerSupported) {
                 // as of 23w14a
                 gameArgs.add("--quickPlayMultiplayer");
                 gameArgs.add(serverAddress + ':' + serverPort);
@@ -93,6 +95,9 @@ public final class StandardLauncher extends AbstractLauncher {
                 gameArgs.add("--port");
                 gameArgs.add(serverPort);
             }
+        } else if (worldName != null && quickPlaySingleplayerSupported) {
+            gameArgs.add("--quickPlaySingleplayer");
+            gameArgs.add(worldName);
         }
 
         // find and invoke the main method