Click the flag and see bubbles form and move up! If they hit an edge, they pop! If you click on them, they can also pop! There is also a counter for how many bubbles have popped.
Demo for educational purposes. If you look inside, you'll find that: 1) Clicking the flag causes the Make Bubbles process 2) New bubbles move around as per the "When I start as a Clone" event script. 3) If you CLICK a bubble, it triggers the POP!