W,A,S,D / Arrow Keys - Move. Mouse - Aim / Shoot. Spacebar - Upgrade / Shop. F - Grenade. Q - Swap Weapon. 1-9 Weapons. C,Z - Special Powers.
Sgt Mayhem is on a mission to kill all the terrorist and destroy all their bases before they make any kind of damage to the city, kill all the three level bosses to complete the game and if you think you are tough try difficulty level.