You are the CEO of Zombies Inc and it's your job to complete the company's one mission: World Domination! Manage zombie attacks, invest in new zombie technologies, and run all other aspects of the business to eventually take over the entire world!
Ricochet bullets around the level to kill all the targets on the screen. If someone can't be hit with a straight shot, look for walls and other objects to bounce the bullet off of to reach your target.
Use bombs in each level to burn the wooden blocks with fire or rust metal with water. Complete all the levels in each elemental world, fire, water, sky, and earth, each having their own unique gameplay styles.
Build a barracks and other structures to create units to attack the opposing army. Complete each level by destroying the enemy base and then use upgrade points to unlock new units and make them more powerful.