diff --git a/internal/game/game.go b/internal/game/game.go
index a0c1bd2..0a7408d 100644
--- a/internal/game/game.go
+++ b/internal/game/game.go
@@ -24,7 +24,9 @@ type Game struct {
 	rotY          itype.Angle
 	rotZ          float32 // Degrees in range (-90, 90)
 
-	fbSize itype.Vec2i
+	fbSize            itype.Vec2i
+	fullscreen        bool
+	lastPos, lastSize itype.Vec2i // Window size before entering fullscreen
 
 	io     imgui.IO
 	gui    guiState
diff --git a/internal/game/logic.go b/internal/game/logic.go
index a7f7edc..7cf27ea 100644
--- a/internal/game/logic.go
+++ b/internal/game/logic.go
@@ -129,6 +129,23 @@ func (g *Game) Init(win *glfw.Window) {
 					win.SetCursorPos(float64(width)/2, float64(height)/2)
 				}
 			}
+
+			if key == glfw.KeyF11 {
+				if g.fullscreen {
+					win.SetMonitor(nil, g.lastPos[0], g.lastPos[1], g.lastSize[0], g.lastSize[1], glfw.DontCare)
+					g.fullscreen = false
+				} else {
+					g.lastPos[0], g.lastPos[1] = win.GetPos()
+					g.lastSize[0], g.lastSize[1] = win.GetSize()
+
+					monitor := glfw.GetPrimaryMonitor()
+					videoMode := monitor.GetVideoMode()
+
+					win.SetMonitor(monitor, 0, 0, videoMode.Width, videoMode.Height, glfw.DontCare)
+
+					g.fullscreen = true
+				}
+			}
 		}
 	})