diff --git a/pygame-wasm/phantomcastle/game/scene.py b/pygame-wasm/phantomcastle/game/scene.py
index 57f2511..a3818fd 100644
--- a/pygame-wasm/phantomcastle/game/scene.py
+++ b/pygame-wasm/phantomcastle/game/scene.py
@@ -36,6 +36,12 @@ class Scene(DrawableGameObject, EventHandler):
         self.background = pygame.image.load(self.assets["bg1k.png"])
         self.background = pygame.transform.scale(self.background, self.rect.size)
 
+        double_bg = pygame.Surface((screen_sz.x * 2, screen_sz.y))
+        double_bg.blit(self.background, (0, 0))
+        double_bg.blit(self.background, (screen_sz.x, 0))
+        self.background = double_bg
+        self.bg_shift = 0
+
         self.total_levels, self.total_coins = 0, 0
 
         hero_sz = Coords(*map(int, box_sz * 0.8))
@@ -75,7 +81,7 @@ class Scene(DrawableGameObject, EventHandler):
         if self.done:
             return
         self.surface.fill("white")
-        self.surface.blit(self.background, self.coords)
+        self.surface.blit(self.background, (-self.bg_shift, 0))
         if self.level_completed:
             self.end.draw()
         else:
@@ -124,6 +130,8 @@ class Scene(DrawableGameObject, EventHandler):
                 self.handle_event(event)
             self.handle_keys(pygame.key.get_pressed())
             self.draw()
+
+            self.bg_shift = (self.bg_shift + 1) % self.rect.width
             pygame.display.flip()
             await asyncio.sleep(0)
             clock.tick(self.fps)