ABOUT THE PRODUCT
You are behind your barricade, which is your only protection. You are armed with a giant slingshot that has tractor beam capabilities, which only work on Zombiis.
Your job through all 18 levels is to defend yourself against the undead and use your slingshot to capture zombiis and catapult them up to Dr. Z who is flying around in his helicopter with a basket or some kind of net hanging down. Once you successfully collect the required amount of Zombiis, you complete the level.