Gather the crates to get ammo and health and avoid explosions and enemy bullets. Use "A", "D", "W", "S" KEYS to move around, press "E" KEY to throw a grenade, hit "R" KEY to throw proximity mine, tap SPACEBAR to jump (double tap to double jump).Use left CTRL KEY to crouch (provides better aiming but you cannot move while crouched), and use 1, 2, 3 KEYS to change firing mode.