If you need any help I get all of the badges in this runthrough
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http://www.youtube.com/watch?v=mX03bzKsfKg
I will be uploading a walkthrough on all challenges for the last badge, just have to figure out have to do challenge 5, I have a method for all of the other ones, (including challenge 4!) youtube.com/user/BadgeCat Subscribe it will be coming up in the very near future (like tomorrow or the next day)
To add to Simple Harmonic's comment. For the maps without bog/holy towers, you want m,g,h,s,4g,s,h,2g. You want the healers first, if your shield dies then your healer will die very fast. But if your healer dies, the shield can last quite a few hits before expiring. The reason you don't want the goblin first is that, there is no reason for it it just dies. On maps with bog/holy towers, you want mhcsgggghcsg. The reason for hcs is because the bog tower does more damage than your healer heals for, so you want the healer to be the first one to die. Same thing here, no reason for goblin. And the mammoth is soh tank.
 "Earn to Die"){kind=icon}
 "Katwalk"){kind=icon}
 "Raze"){kind=icon}
 "Waterfalls 3"){kind=icon}
 "Distopix"){kind=icon}
 "Flood Runner 3"){kind=icon}
 "Obliterate Everything"){kind=icon}
 "Mud and Blood 2"){kind=icon}
 "Bot Arena 3"){kind=icon}
 "Concerned Joe"){kind=icon}
 "endeavor"){kind=icon}
 "Book of Mages: The Dark Times"){kind=icon}
 "Villainous"){kind=icon}
 "Flight"){kind=icon}