Sir, I don't know if you know this, but your game does not obey the laws of physics. In fact, physicists are vomiting at the sheer existence of your game, even if they don't know about it. In the name of all the students in college physics courses, we thank you.
This is how you get the special zombies. Do what is shown here and you will be unstoppable! Mwahaha! MJ - Destroy the grave in Jamaica ''Easier to use the bomb'' [Mexico] Tank- Kill Rambo in Qandahar [Middle East] Boomer Santa- Kill Santa in Nuunok [Greenland] Col. Sanders- Kill him in Kentucky [America] Ronald Mcdonald- Kill him in London [Europe] [can be found in other places] Venom- Kill Spiderman in New York [America] KEEP THIS COMMENT ALIVE!!!!
 "Knightmare Tower")
 "Burrito Bison")
 "Kingdom Rush")
 "Bit Hacker V 0.2 remix")
 "Infectonator : World Dominator")
 "Symbiosis")
 "Demons vs Fairyland")
 "Dawn of the Dragons")
 "The Enchanted Cave 2")
 "Monty's Moon")
 "Plunder Mars")
 "Strikeforce Kitty 2")
 "Bearbarians")
 "MegaDrill")