diff --git a/assets/scripts/zenity-help.bash b/assets/scripts/zenity-help.bash
index edce155..4df0a40 100755
--- a/assets/scripts/zenity-help.bash
+++ b/assets/scripts/zenity-help.bash
@@ -46,6 +46,8 @@ Key press actions:
   Q - display your score and the number of remaining tokens
   S - toggle SKYBOX ON/OFF
   N - new SKYBOX
+  Shift+Q - quit
+  F11 - toggle full-screen
 
 OR USE THE GAMEPAD:
 
diff --git a/game.go b/game.go
index a8e715c..8ccf72f 100644
--- a/game.go
+++ b/game.go
@@ -35,7 +35,14 @@ const skyboxChance = 0.25 // the chance of having withSkybox==true on the new st
 
 // data structure for the game
 type Mki3dGame struct {
+	// Quit the game
 	Quit bool
+
+	// is full screen mode?
+	FullScreen bool
+	// Saved position and size of non-fullscreen window
+	PosX, PosY            int
+	SizeWidth, SizeHeight int
 	// assets info
 	AssetsPtr *Assets
 	// GLFW data
diff --git a/help.go b/help.go
index 08bfff6..5319a5d 100644
--- a/help.go
+++ b/help.go
@@ -46,6 +46,8 @@ Key press actions:
   Q - display your score and the number of remaining tokens
   S - toggle SKYBOX ON/OFF
   N - new SKYBOX
+  Shift+Q - quit
+  F11 - toggle full-screen
 
 OR USE THE GAMEPAD:
 
diff --git a/key-callback.go b/key-callback.go
index 69a6598..9bb6514 100644
--- a/key-callback.go
+++ b/key-callback.go
@@ -119,6 +119,23 @@ func (g *Mki3dGame) KeyCallback(w *glfw.Window, key glfw.Key, scancode int, acti
 			g.Skybox.RenderRandomCube()
 			g.withSkybox = true
 
+		case key == glfw.KeyF11: /* toggle full-screen */
+			if !g.FullScreen {
+				/// set full-screen
+				g.PosX, g.PosY = w.GetPos()
+				g.SizeWidth, g.SizeHeight = w.GetSize()
+				monitor := glfw.GetPrimaryMonitor()
+				mode := monitor.GetVideoMode()
+				w.SetMonitor(monitor, 0, 0, mode.Width, mode.Height, mode.RefreshRate)
+				g.FullScreen = true
+			} else {
+				// unset full-screen
+				monitor := glfw.GetPrimaryMonitor()
+				mode := monitor.GetVideoMode()
+				w.SetMonitor(nil, g.PosX, g.PosY, g.SizeWidth, g.SizeHeight, mode.RefreshRate)
+				g.FullScreen = false
+			}
+
 		}
 	}
 }
diff --git a/main.go b/main.go
index eff2e48..0f96568 100644
--- a/main.go
+++ b/main.go
@@ -169,9 +169,9 @@ func main() {
 
 	glfw.SwapInterval(1) // try to avoid tearing ???
 	// game.CheckGamepad() // test
+
 	// main loop
 	for !window.ShouldClose() && !game.Quit {
-
 		// Maintenance
 		window.SwapBuffers()
 		if doInMainThread != nil {