Finish lv7 at first try.Simple walkthrough:Earth tower can kill every thing excpet barbarian and golem,air tower can kill the rest and three max reflector can kill any boss because boss wont move.So use earth and air tower only,upgrade earth air monk and magic,get a max watchtower asap(excepet lv15),then do whatever you like.
 "The Keeper Of 4 Elements"){kind=icon}