The old castle was equipped with a laboratory used for the study of alien life forms. But the experimental forms infected the earth and mutated. The staff quickly evacuated and only the mutants remained. You can only clear the base with a weapon. Kill all of the monsters.

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