Your mission here is simple and straight forward, soldier - kill all enemies on a stage, without dying during the process. Controls are as such: aim with the mouse, shoot by clicking the left mouse button, reload with the R key, hide with the space bar, and choose your weapons using the 1-3 keys (1 for pistol, 2 for shotgun, 3 for chaingun). Hiding is useful in that you can't be hurt while you're hiding... but, you can't shoot either. Before you start out, you can set all sorts of different parameters to your liking to change your game experience. Change up the number of zombies on a stage, total zombies, if you're able to be using armor or not, enabling boss fights, and changing zombie types. Beyond that you can further tweak things with the music track that will play, and the background in which you'll fight wave after wave of bloodthirsty foes. If you want to you can also modify clip sizes, numbers of bullets you have for different weapons, and the amount of health enemies have as well as how much damage they inflict - but keep in mind, when you change these options you won't be able to win the prize at the end of the game (the source code of it, which could be fun to tinker with, for those that know how to code).