For one of my undergrad classes at Cornell (ECE 2300, Digital Logic and Computer Organization), we had to make a game that tests two players' reaction times. The way it works is that there are five rounds where, once each round starts, the first player to hit the button gets a point. The player that reaches 5 points first wins! But beware, if one player cheats by trying to press the button early, the other player gets the point for that round. Check out my gallery to see it in action!