Pong is a game where you hit a ball back and forth. If the ball lands beyond the opponent's reach, you get a point! First to 5 points wins, and a new round starts. The game will get faster as time passes.
Rock, paper, scissors is a well known game. Paper covers rock, rock crushes scissors, and scissors cuts paper. If you win the round, you get a point!
Snake is a game where you control a snake with arrow keys and eat apples to grow longer. Don't crash into the border or your own tail though!