Cool Pong is a remake of one of the earliest arcades Pong. As the name suggests, it's not only a simple remake of Pong, because in this game there are powerups! Box that randomly sized and showed up at intervals in the middle of the screen is the one containing the powerup.  To gain the powerup, the ball returned from your paddle must hit the box. There are 5 powerups available:

1. Big Paddle: makes own's paddle bigger.
2. Mini-paddle: makes opponent's paddle smaller.
3. Super-ball: speeds up the ball returned from own's paddle.
4. Invisible Paddle: occasionally hides opponent's paddle.
5. Invisible Ball: occasionally hides opponent's paddle.

Note that red paddle means AI while green one is human-controlled.

You can view the GitHub repository here.