I am able to imagine better situation than being locked in labyrinth of corridors filled with brutal and ugly looking monsters or zombies. The game is classic FPS in Doom or Wolfenstein style. You try to survive, pass the task and find the exit. It's no surprise when you bump into a zombie hiding behind a corner. Get to better and better weapons where the rule is to reload before next progress. Use map, shop and enjoy the dark atmosphere with plenty of blood.