You will encounter alien invaders conducting experiments in a secret bunker. Stop the invaders. Engage in battle with ruthless zombies, followed by robots and reptilians. Use and train your survival skills and strategies to stay alive and deal with the army of the living dead. But the main goal is to find and defeat the boss. Uncover the secrets of the bunker. Discover secrets, develop a hero.

The game has a multiplayer mode. To activate it, click on the Multiplayer indicator on the main screen. This is a new type of game where the task is to evacuate the bunker. To return to the saved single player game, disable multiplayer.