1. Sandbox mode: In this mode, you can create the units in any location and decide on their weapons, damage resistance, health, movement speed, some AI behaviors, etc.
Moreover, You can modify the rules of the game, such as unit spawn system that can automatically spawn soldiers and zombies. As well as the game of time, conditions of victory and defeat, zombie infection, etc. In short, You can make the gameplay a big change by simply modify the rules. Of course, if you do not want to do it by self I also give you some preset ways to play;
2. Third Person Shooter: You can create a soldier and control it to move, aim and shoot;
3. Multiplayer: You can play with others online, or play with your friends through WIFI router.