kinda easy :) completed on hard just build a maze outa 1st towers and upgrade them to top; ur maze should have room for a floor trap, so it slows them down, this helps ALOT! then build boss towers replacing the middle maze towers, do the 75k upgrade on the boss towers and build more, when you have around 10-15 boss towers upgrade them to top. pretty simple if ur a pro of TD games. good game, although needs more types of monsters and level types. 5/5
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