Player 1: Use W/S to move. Player 2: Use the Up and Down arrows to move. Press L to turn wireframe mode on and off. First to ten points wins!
So, I finally figured out how to make filled 3D cuboids. Nice. Sorry if the bouncing's a little buggy, I did the best I could. If you want to make a game like this, I have an extremely easy-to-use 3D graphics engine on my profile. Actually, for convenience, here's the link: https://scratch.mit.edu/projects/238671758/ Aaaand we're over 2.5 thousand views. For such a mediocre project, it didn't do too badly!
