diff --git a/examples/raycaster/game.go b/examples/raycaster/game.go
index e0413c1..2c66cf3 100644
--- a/examples/raycaster/game.go
+++ b/examples/raycaster/game.go
@@ -31,7 +31,11 @@ func NewGame (world World, textures Textures) (game *Game) {
 	return
 }
 
-func (game *Game) DrawTo (canvas canvas.Canvas, bounds image.Rectangle) {
+func (game *Game) DrawTo (
+	canvas canvas.Canvas,
+	bounds image.Rectangle,
+	onDamage func (image.Rectangle),
+) {
 	if canvas == nil {
 		select {
 		case game.stopChan <- true:
@@ -41,7 +45,7 @@ func (game *Game) DrawTo (canvas canvas.Canvas, bounds image.Rectangle) {
 		game.running = true
 		go game.run()
 	}
-	game.Raycaster.DrawTo(canvas, bounds)
+	game.Raycaster.DrawTo(canvas, bounds, onDamage)
 }
 
 func (game *Game) Stamina () float64 {
diff --git a/examples/raycaster/raycaster.go b/examples/raycaster/raycaster.go
index 3ccd703..54ee19d 100644
--- a/examples/raycaster/raycaster.go
+++ b/examples/raycaster/raycaster.go
@@ -49,9 +49,9 @@ func NewRaycaster (world World, textures Textures) (element *Raycaster) {
 		textures: textures,
 		renderDistance: 8,
 	}
-	element.Core, element.core = core.NewCore(element.drawAll)
+	element.Core, element.core = core.NewCore(element, element.drawAll)
 	element.FocusableCore,
-	element.focusableControl = core.NewFocusableCore(element.Draw)
+	element.focusableControl = core.NewFocusableCore(element.core, element.Draw)
 	element.core.SetMinimumSize(64, 64)
 	return
 }