W&S for Player 1 Movement, D to fire. Arrow keys Up & Down for Player 2 Movement, Left arrow to fire. Keys 1-2-3-4 are for the upgrades: More Bullets Per Round, Increased fire rate, Shorter Cooldown and Increased Bullet Speed subsequently. Keys 7-8-9-0 are for Increased Bullet Speed, Shorter Cooldown, Increased fire rate and More Bullets Per Round subsequently. For Ricochet, press 5 for Player 1 and 6 for Player 2.