Pong. Use the W and S keys to control player 1 (which is on the left hand side) and the spacebar to launch the ball. You can do multiplayer by entering 2 in the box at the start and using the up and down arrow keys for player 2. When launching the ball, you HAVE to make your paddle move while you launch it, or it'll go straight forever until you launch the ball again.
Well this is just a simple thing I made in my weekly Scratch class that I take, so yeah. Thanks to my teacher though!