Box 10 Brawl
This is a nicely made fighting game. You select 1 out of 4 available fighters and need to defeat your opponent. The first one to win 3 rounds wins the game.
Instructions:
Move your character and jump with A-S-D-W. Punch with U and kick with I. You'll see so called "Special" meter at the bottom. When this meter reaches its maximum value press O for the special attack.