Tribulation

You're the last man alive on Earth, and you must keep it that way by fighting off swarms of zombies in a parking lot. Gain experience, souls, and rage as you kill your undead foes. When you gain enough experience and level up, a skill tree will pop up and you can select a skill. Souls are your currency for purchasing weapons, which can be viewed by clicking on the box in the top right-hand corner of the screen. When your rage bar is full, press space bar to activate a temporary mode in which you deal double damage to zombies.