With three different modes including: Survival Mode, Free Range Mode, and Training Exercise mode. In Survival Mode select your load out, pick a primary weapon and a sidearm and different perks that fit your playing style and attempt to last the longest competing for the highest score of zombie killing bloody mayhem. Fight against zombies with over 34 different unique guns for the highest score with an accurate ballistics engine or go to the range and test them all and try training exercises. In Free range mode take full advantage of the heavily optimized ballistics bullet and firearm simulating engine. its almost like going to the range with out leaving your computer! And in Training exercise mode increase your operator status and reaction time in an intense battle for the fastest and most accurate time. This is a CPU intensive game, although it is heavily optimized if you notice any performance issues its recommended to switch to low quality at the menu.