2 player game!
Use 2 Xbox controllers to play. A jumps, X shoots, B uses your item.
Fight your way to the top, kill the terrorist leader, fight for his parachute to race back down and fight your way up the rebuilt, higher and improved tower again. And again.
If one player gets killed, get back to the SWAT car to revive them.
If both players are killed, it's game over.