One character with different weapons on two maps. 10 levels against soldiers and 10 levels against zombies. The levels open gradually, the difficulty increases. For passing the levels, they give money, with them you can buy first-aid kits and grenades. You can buy grenades and first aid kits in the game settings.
WASD - Move E - Use medical kit Tab - select weapon C - Crouch Esc - Pause Game R - Reload weapon Space - Jump G - Use Grenade K - Drop Weapon Left Shift - Run