i have found a glitch in the game...i was playing 2 games on Kongregate (this being one of them). When i beat Campaign mode and beat every mission, I didnt get it. It turns out i was unplugged on that game so i didnt get the achievment and i cant restart it :( but i can tell you guys how to beat the last level in zone 3. when you get to the boss, look for the weapon that switches your position with the boss. when you get it, fall off the edge and switch places with him. no matter how hard he tries, he cant get back up (if u do it right) :D
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