Against CPU: Move the paddle with your mouse to return the ball! I made this when back I knew very little about coding, so it doesn't have any strategy or anything like that xD Single Player: Move the paddle with your mouse and bounce the ball around, adding to your score every time you touch the ball with your paddle and taking away from it when the ball touches red. Again, this isn't professional :) Multiplayer (1v1): Imo, this is the most fun part of the game. The green paddle moves with W and S, while the blue paddle moves with the up and down arrows. Return the ball to your opponent, and hope they don't hit it back! Whenever you or your opponent misses the ball and it touches red, the other person gets a point.
Double-click the green flag! I made this project long ago in my old acc, btw :D