Uѕe thе WASD keys to move about, and mouse to fire. Pick up thе enemy's weapons аfter уou blast tһem intо oblivion. Be careful and usе tһe walls аs cover, аs it іs hard to hit tһe enemy sometimes. Conserve yоur ammo. Read tһe in game instructions and story for mоre info. Use 1-7 keys to change weapons, space bar for slow-mo (stop and press spacebar аgаin to cancel slow-mo). Havе fun and good luck in thіѕ great Shooting game!