Level 3- How to get the bonus. Go to the hill with the door scribbled below it. crouch right beside the rock's right located left of the hill. Then go inside the locked door (treat it like a normal door). Dont freak if you think this is impossible because it is. DON'T LET THIS COMMENT DIE OUT!!!
How to get all special zombies. Tank: I dont know who the guy is so just go killing Qandahar (Middle East). MJ: Destroy the Grave in Jamica (Mexico). Boomer Santa: Kill Santa in Nunock (Greenland). Cernall Sanderds: Kill him in Kentucky (America). Ronald Mc.Donald: Kill him wherever he can be found (I say London or Vancouver because their theyre usally out in the first wave). Venom: Kill Spider-Man in New York (America) KEEP THIS COMMENT ALIVE OR YOU WONT BE ALIVE IN THE GAME!!!
 "Enough Plumbers"){kind=icon}
 "Warlords: Heroes"){kind=icon}
 "Free Rider 2"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "The Fancy Pants Adventures"){kind=icon}
 "Infectonator : World Dominator"){kind=icon}
 "Raze"){kind=icon}
 "Homerun In Berzerk Land: Berzerk Ball"){kind=icon}
 "Bunny Invasion: Easter Special"){kind=icon}
 "Just Chatting"){kind=icon}
 "Dress up stickman 2!"){kind=icon}
 "Thing-Thing Arena 2"){kind=icon}
 "Boxhead: The Zombie Wars"){kind=icon}
 "Neon Rider"){kind=icon}