20. Silly Square

• A little square randomly drifts around the screen.
• You win if you hit the “w” key.
• Hitting the “r” key moves the square back to its starting position.
• When you win, some win screen appears and the animation stops.

Items to practice:

• stop-when clause in big bang
• win screen draw-handler

Extras:

• You lose if you hit the “q” key.
• Also win if you click on the square.