Press W and S to operate the left slider (player 1). Press the up arrow key and the down arrow key to operate the right slider (player 2).
I have to invent a sport, as well as create a visual demonstration of it as a video game for a school project. Scratch seemed the easiest option. However, I did have to remix a 2 player pong game, and I chose the one by @GenChico. However, (no offense, @GenChico) this poor, poor, pong game had some shabby coding. I fixed it, and added my own modifications so that it could pass as a "sport."