In the factory, all of the zombies turned into quick monsters, and you must be careful. Run and hide wherever you can. Outsmart the monsters and pick them off one by one with the weapons you have found.
Control keys:
F - Pick up weapons, ammo
1,2,3 ... Change weapons
WASD - Character movement
SPACEBAR - Jump
SHIFT - Sprint
Esc - Exit to the menu
LKM - Shoot