diff --git a/examples/windowsize/main.go b/examples/windowsize/main.go
index b50562c68..f03c75aa2 100644
--- a/examples/windowsize/main.go
+++ b/examples/windowsize/main.go
@@ -431,7 +431,6 @@ func main() {
 		ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
 	}
 
-	ebiten.SetInitFocused(*flagInitFocused)
 	if !*flagInitFocused {
 		ebiten.SetRunnableOnUnfocused(true)
 	}
@@ -464,6 +463,7 @@ func main() {
 	default:
 		log.Fatalf("unexpected graphics library: %s", *flagGraphicsLibrary)
 	}
+	op.InitUnfocused = !*flagInitFocused
 
 	const title = "Window Size (Ebitengine Demo)"
 	ww := int(float64(g.width) * initScreenScale)
diff --git a/internal/ui/ui.go b/internal/ui/ui.go
index f41f4a09b..745c3ebd7 100644
--- a/internal/ui/ui.go
+++ b/internal/ui/ui.go
@@ -98,4 +98,5 @@ func (u *UserInterface) dumpImages(dir string) (string, error) {
 
 type RunOptions struct {
 	GraphicsLibrary GraphicsLibrary
+	InitUnfocused   bool
 }
diff --git a/internal/ui/ui_glfw.go b/internal/ui/ui_glfw.go
index 6b48e417f..6b4911fc0 100644
--- a/internal/ui/ui_glfw.go
+++ b/internal/ui/ui_glfw.go
@@ -93,7 +93,6 @@ type userInterfaceImpl struct {
 	initWindowFloating       bool
 	initWindowMaximized      bool
 	initScreenTransparent    bool
-	initFocused              bool
 
 	origWindowPosX        int
 	origWindowPosY        int
@@ -135,7 +134,6 @@ func init() {
 		initWindowPositionYInDIP: invalidPos,
 		initWindowWidthInDIP:     640,
 		initWindowHeightInDIP:    480,
-		initFocused:              true,
 		fpsMode:                  FPSModeVsyncOn,
 		origWindowPosX:           invalidPos,
 		origWindowPosY:           invalidPos,
@@ -490,27 +488,6 @@ func (u *userInterfaceImpl) isWindowBeingClosed() bool {
 	return v
 }
 
-func (u *userInterfaceImpl) isInitFocused() bool {
-	if microsoftgdk.IsXbox() {
-		return true
-	}
-
-	u.m.RLock()
-	v := u.initFocused
-	u.m.RUnlock()
-	return v
-}
-
-func (u *userInterfaceImpl) setInitFocused(focused bool) {
-	if microsoftgdk.IsXbox() {
-		return
-	}
-
-	u.m.Lock()
-	u.initFocused = focused
-	u.m.Unlock()
-}
-
 func (u *userInterfaceImpl) ScreenSizeInFullscreen() (int, int) {
 	if !u.isRunning() {
 		return u.initFullscreenWidthInDIP, u.initFullscreenHeightInDIP
@@ -933,9 +910,9 @@ func (u *userInterfaceImpl) init(options *RunOptions) error {
 	}
 	glfw.WindowHint(glfw.Floating, floating)
 
-	focused := glfw.False
-	if u.isInitFocused() {
-		focused = glfw.True
+	focused := glfw.True
+	if options.InitUnfocused {
+		focused = glfw.False
 	}
 	glfw.WindowHint(glfw.FocusOnShow, focused)
 
@@ -1467,13 +1444,6 @@ func (u *userInterfaceImpl) resetForTick() {
 	u.m.Unlock()
 }
 
-func (u *userInterfaceImpl) SetInitFocused(focused bool) {
-	if u.isRunning() {
-		panic("ui: SetInitFocused must be called before the main loop")
-	}
-	u.setInitFocused(focused)
-}
-
 func (u *userInterfaceImpl) Input() *Input {
 	return &u.input
 }
diff --git a/internal/ui/ui_js.go b/internal/ui/ui_js.go
index b8834de58..e327c0daf 100644
--- a/internal/ui/ui_js.go
+++ b/internal/ui/ui_js.go
@@ -77,7 +77,6 @@ type userInterfaceImpl struct {
 	fpsMode             FPSModeType
 	renderingScheduled  bool
 	running             bool
-	initFocused         bool
 	cursorMode          CursorMode
 	cursorPrevMode      CursorMode
 	cursorShape         CursorShape
@@ -96,7 +95,6 @@ type userInterfaceImpl struct {
 func init() {
 	theUI.userInterfaceImpl = userInterfaceImpl{
 		runnableOnUnfocused: true,
-		initFocused:         true,
 	}
 	theUI.input.ui = &theUI.userInterfaceImpl
 }
@@ -638,7 +636,7 @@ func (u *userInterfaceImpl) forceUpdateOnMinimumFPSMode() {
 }
 
 func (u *userInterfaceImpl) Run(game Game, options *RunOptions) error {
-	if u.initFocused && window.Truthy() {
+	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).
 		isInIframe := !window.Get("location").Equal(window.Get("parent").Get("location"))
@@ -689,13 +687,6 @@ func (u *userInterfaceImpl) resetForTick() {
 	u.input.resetForTick()
 }
 
-func (u *userInterfaceImpl) SetInitFocused(focused bool) {
-	if u.running {
-		panic("ui: SetInitFocused must be called before the main loop")
-	}
-	u.initFocused = focused
-}
-
 func (u *userInterfaceImpl) Input() *Input {
 	return &u.input
 }
diff --git a/internal/ui/ui_mobile.go b/internal/ui/ui_mobile.go
index 953fe9b70..7fc266b1f 100644
--- a/internal/ui/ui_mobile.go
+++ b/internal/ui/ui_mobile.go
@@ -433,10 +433,6 @@ func (u *userInterfaceImpl) resetForTick() {
 	u.input.resetForTick()
 }
 
-func (u *userInterfaceImpl) SetInitFocused(focused bool) {
-	// Do nothing
-}
-
 func (u *userInterfaceImpl) Input() *Input {
 	return &u.input
 }
diff --git a/internal/ui/ui_nintendosdk.go b/internal/ui/ui_nintendosdk.go
index c095ff418..208b5e902 100644
--- a/internal/ui/ui_nintendosdk.go
+++ b/internal/ui/ui_nintendosdk.go
@@ -133,9 +133,6 @@ func (*userInterfaceImpl) IsScreenTransparent() bool {
 func (*userInterfaceImpl) SetScreenTransparent(transparent bool) {
 }
 
-func (*userInterfaceImpl) SetInitFocused(focused bool) {
-}
-
 func (*userInterfaceImpl) Input() *Input {
 	return &theUI.input
 }
diff --git a/run.go b/run.go
index 7ac42eaa6..efd46dd96 100644
--- a/run.go
+++ b/run.go
@@ -232,8 +232,15 @@ func RunGame(game Game) error {
 // RungameOptions represents options for RunGameWithOptions.
 type RunGameOptions struct {
 	// GraphicsLibrary is a graphics library Ebitengine will use.
+	//
 	// The default (zero) value is GraphicsLibraryAuto, which lets Ebitengine choose the graphics library.
 	GraphicsLibrary GraphicsLibrary
+
+	// InitUnfocused represents whether the window is unfocused or not on launching.
+	// InitUnfocused is valid on desktops and browsers.
+	//
+	// The default (zero) value is false, which means that the window is focused.
+	InitUnfocused bool
 }
 
 // RunGameWithOptions starts the main loop and runs the game with the specified options.
@@ -598,15 +605,26 @@ func SetScreenTransparent(transparent bool) {
 // SetInitFocused panics if this is called after the main loop.
 //
 // SetInitFocused is cuncurrent-safe.
+//
+// Deprecated: as of v2.5. Use RunGameWithOptions instead.
 func SetInitFocused(focused bool) {
-	ui.Get().SetInitFocused(focused)
+	if focused {
+		atomic.StoreInt32(&initUnfocused, 0)
+	} else {
+		atomic.StoreInt32(&initUnfocused, 1)
+	}
 }
 
+var initUnfocused int32 = 0
+
 func toUIRunOptions(options *RunGameOptions) *ui.RunOptions {
 	if options == nil {
-		return &ui.RunOptions{}
+		return &ui.RunOptions{
+			InitUnfocused: atomic.LoadInt32(&initUnfocused) != 0,
+		}
 	}
 	return &ui.RunOptions{
 		GraphicsLibrary: ui.GraphicsLibrary(options.GraphicsLibrary),
+		InitUnfocused:   options.InitUnfocused,
 	}
 }