diff --git a/internal/ui/run_glfw_notsinglethread.go b/internal/ui/run_notsinglethread.go
similarity index 90%
rename from internal/ui/run_glfw_notsinglethread.go
rename to internal/ui/run_notsinglethread.go
index 7718e6ce5..8e8bbbe8e 100644
--- a/internal/ui/run_glfw_notsinglethread.go
+++ b/internal/ui/run_notsinglethread.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !android && !ios && !js && !nintendosdk && !playstation5 && !ebitenginesinglethread && !ebitensinglethread
+//go:build !android && !ios && !js && !ebitenginesinglethread && !ebitensinglethread
 
 package ui
 
@@ -25,7 +25,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/thread"
 )
 
-func (u *UserInterface) Run(game Game, options *RunOptions) error {
+func (u *UserInterface) run(game Game, options *RunOptions) error {
 	u.mainThread = thread.NewOSThread()
 	u.renderThread = thread.NewOSThread()
 	graphicscommand.SetRenderThread(u.renderThread)
diff --git a/internal/ui/run_glfw_singlethread.go b/internal/ui/run_singlethread.go
similarity index 86%
rename from internal/ui/run_glfw_singlethread.go
rename to internal/ui/run_singlethread.go
index 2c3860307..0fc6cb29f 100644
--- a/internal/ui/run_glfw_singlethread.go
+++ b/internal/ui/run_singlethread.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !android && !ios && !js && !nintendosdk && !playstation5 && (ebitenginesinglethread || ebitensinglethread)
+//go:build js || (!android && !ios && (ebitenginesinglethread || ebitensinglethread))
 
 package ui
 
@@ -21,7 +21,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/thread"
 )
 
-func (u *UserInterface) Run(game Game, options *RunOptions) error {
+func (u *UserInterface) run(game Game, options *RunOptions) error {
 	// Initialize the main thread first so the thread is available at u.run (#809).
 	u.mainThread = thread.NewNoopThread()
 	u.renderThread = thread.NewNoopThread()
diff --git a/internal/ui/ui.go b/internal/ui/ui.go
index e39f0d6c5..b7fa0dd0f 100644
--- a/internal/ui/ui.go
+++ b/internal/ui/ui.go
@@ -22,6 +22,7 @@ import (
 
 	"github.com/hajimehoshi/ebiten/v2/internal/atlas"
 	"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
+	"github.com/hajimehoshi/ebiten/v2/internal/thread"
 )
 
 // RegularTermination represents a regular termination.
@@ -79,6 +80,9 @@ type UserInterface struct {
 
 	whiteImage *Image
 
+	mainThread   thread.Thread
+	renderThread thread.Thread
+
 	userInterfaceImpl
 }
 
diff --git a/internal/ui/ui_glfw.go b/internal/ui/ui_glfw.go
index d255e11f7..61e6e3ba8 100644
--- a/internal/ui/ui_glfw.go
+++ b/internal/ui/ui_glfw.go
@@ -107,9 +107,7 @@ type userInterfaceImpl struct {
 	darwinInitOnce        sync.Once
 	bufferOnceSwappedOnce sync.Once
 
-	mainThread   thread.Thread
-	renderThread thread.Thread
-	m            sync.RWMutex
+	m sync.RWMutex
 }
 
 const (
@@ -123,6 +121,10 @@ func init() {
 	runtime.LockOSThread()
 }
 
+func (u *UserInterface) Run(game Game, options *RunOptions) error {
+	return u.run(game, options)
+}
+
 func (u *UserInterface) init() error {
 	u.userInterfaceImpl = userInterfaceImpl{
 		runnableOnUnfocused:      true,
diff --git a/internal/ui/ui_js.go b/internal/ui/ui_js.go
index 383534eb3..b9dd6a710 100644
--- a/internal/ui/ui_js.go
+++ b/internal/ui/ui_js.go
@@ -390,9 +390,7 @@ func (u *UserInterface) needsUpdate() bool {
 	return false
 }
 
-func (u *UserInterface) loop(game Game) <-chan error {
-	u.context = newContext(game)
-
+func (u *UserInterface) loopGame() error {
 	errCh := make(chan error, 1)
 	reqStopAudioCh := make(chan struct{})
 	resStopAudioCh := make(chan struct{})
@@ -476,7 +474,7 @@ func (u *UserInterface) loop(game Game) <-chan error {
 		}
 	}()
 
-	return errCh
+	return <-errCh
 }
 
 func (u *UserInterface) init() error {
@@ -743,9 +741,10 @@ func (u *UserInterface) forceUpdateOnMinimumFPSMode() {
 }
 
 func (u *UserInterface) Run(game Game, options *RunOptions) error {
-	u.setRunning(true)
-	defer u.setRunning(false)
+	return u.run(game, options)
+}
 
+func (u *UserInterface) initOnMainThread(options *RunOptions) error {
 	if !options.InitUnfocused && window.Truthy() {
 		// Do not focus the canvas when the current document is in an iframe.
 		// Otherwise, the parent page tries to focus the iframe on every loading, which is annoying (#1373).
@@ -770,7 +769,7 @@ func (u *UserInterface) Run(game Game, options *RunOptions) error {
 		bodyStyle.Set("backgroundColor", "#000")
 	}
 
-	return <-u.loop(game)
+	return nil
 }
 
 func (u *UserInterface) updateScreenSize() {
diff --git a/internal/ui/ui_mobile.go b/internal/ui/ui_mobile.go
index c25d8f45f..46f4088bd 100644
--- a/internal/ui/ui_mobile.go
+++ b/internal/ui/ui_mobile.go
@@ -241,7 +241,7 @@ func (u *UserInterface) SetForeground(foreground bool) error {
 func (u *UserInterface) Run(game Game, options *RunOptions) error {
 	u.setGBuildSizeCh = make(chan struct{})
 	go func() {
-		if err := u.run(game, true, options); err != nil {
+		if err := u.runMobile(game, true, options); err != nil {
 			// As mobile apps never ends, Loop can't return. Just panic here.
 			panic(err)
 		}
@@ -252,13 +252,13 @@ func (u *UserInterface) Run(game Game, options *RunOptions) error {
 
 func (u *UserInterface) RunWithoutMainLoop(game Game, options *RunOptions) {
 	go func() {
-		if err := u.run(game, false, options); err != nil {
+		if err := u.runMobile(game, false, options); err != nil {
 			u.errCh <- err
 		}
 	}()
 }
 
-func (u *UserInterface) run(game Game, mainloop bool, options *RunOptions) (err error) {
+func (u *UserInterface) runMobile(game Game, mainloop bool, options *RunOptions) (err error) {
 	// Convert the panic to a regular error so that Java/Objective-C layer can treat this easily e.g., for
 	// Crashlytics. A panic is treated as SIGABRT, and there is no way to handle this on Java/Objective-C layer
 	// unfortunately.
diff --git a/internal/ui/ui_nintendosdk.go b/internal/ui/ui_nintendosdk.go
index 008f5c706..6d19d1692 100644
--- a/internal/ui/ui_nintendosdk.go
+++ b/internal/ui/ui_nintendosdk.go
@@ -21,15 +21,11 @@ package ui
 import "C"
 
 import (
-	stdcontext "context"
 	"errors"
 	"image"
 	"runtime"
 	"sync"
 
-	"golang.org/x/sync/errgroup"
-
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl"
 	"github.com/hajimehoshi/ebiten/v2/internal/thread"
@@ -84,15 +80,10 @@ func (u *UserInterface) init() error {
 }
 
 func (u *UserInterface) Run(game Game, options *RunOptions) error {
-	u.mainThread = thread.NewOSThread()
-	u.renderThread = thread.NewOSThread()
-	graphicscommand.SetRenderThread(u.renderThread)
-
-	u.setRunning(true)
-	defer u.setRunning(false)
-
-	u.context = newContext(game)
+	return u.run(game, options)
+}
 
+func (u *UserInterface) initOnMainThread(options *RunOptions) error {
 	g, lib, err := newGraphicsDriver(&graphicsDriverCreatorImpl{}, options.GraphicsLibrary)
 	if err != nil {
 		return err
@@ -107,45 +98,25 @@ func (u *UserInterface) Run(game Game, options *RunOptions) error {
 
 	initializeProfiler()
 
-	ctx, cancel := stdcontext.WithCancel(stdcontext.Background())
-	defer cancel()
-
-	var wg errgroup.Group
-
-	// Run the render thread.
-	wg.Go(func() error {
-		defer cancel()
-		_ = u.renderThread.Loop(ctx)
-		return nil
-	})
-
-	// Run the game thread.
-	wg.Go(func() error {
-		defer cancel()
-
-		u.renderThread.Call(func() {
-			u.egl.makeContextCurrent()
-		})
-
-		for {
-			recordProfilerHeartbeat()
-
-			if err := u.context.updateFrame(u.graphicsDriver, float64(C.kScreenWidth), float64(C.kScreenHeight), deviceScaleFactor, u, func() {
-				u.egl.swapBuffers()
-			}); err != nil {
-				return err
-			}
-		}
-	})
-
-	// Run the main thread.
-	_ = u.mainThread.Loop(ctx)
-	if err := wg.Wait(); err != nil {
-		return err
-	}
 	return nil
 }
 
+func (u *UserInterface) loopGame() error {
+	u.renderThread.Call(func() {
+		u.egl.makeContextCurrent()
+	})
+
+	for {
+		recordProfilerHeartbeat()
+
+		if err := u.context.updateFrame(u.graphicsDriver, float64(C.kScreenWidth), float64(C.kScreenHeight), deviceScaleFactor, u, func() {
+			u.egl.swapBuffers()
+		}); err != nil {
+			return err
+		}
+	}
+}
+
 func (*UserInterface) DeviceScaleFactor() float64 {
 	return deviceScaleFactor
 }
diff --git a/internal/ui/ui_playstation5.go b/internal/ui/ui_playstation5.go
index e8dd04e76..4a2a6d802 100644
--- a/internal/ui/ui_playstation5.go
+++ b/internal/ui/ui_playstation5.go
@@ -64,10 +64,15 @@ func (u *UserInterface) init() error {
 }
 
 func (u *UserInterface) Run(game Game, options *RunOptions) error {
-	u.setRunning(true)
-	defer u.setRunning(false)
+	return u.run(game, options)
+}
 
-	// TODO: Implement this.
+func (u *UserInterface) initOnMainThread(options *RunOptions) error {
+	return nil
+}
+
+func (u *UserInterface) loopGame() error {
+	// TODO: Implement this
 	return nil
 }