massive glitch with staggered towers on splitting waves.
if your towers are set half a unit apart (rather than in-line with each other) then when the enemies split, sometimes they split through.
i cannot tell you how many times this made me restart well over halfway through a level
Best way to exploit this game:
Grind xp/gold at the COLOSSEUM (it's in world 2). First two times through you can get health/magic elixirs (they give you minor regen). After that, you get a chest of 500 gold reward every time through (huge help for buying the $5k items you need to complete the bestiary badge). In the process of grinding I also noticed that AFTER you get each stat to lvl 30, you can level each one up ONE more time. This costs a ton of xp, but that doesn't really matter seeing as you it's a ridiculously easy grind. Maxing attack makes you fire LASERS (yes. it really does. 999 damage per hit at that.), health basically makes you invincible, and magic basically gives you infinite mana. Takes a couple times to grind all that xp through, but if you pick the attack one first, each run through the colosseum is easily under 15 minutes. [+] so others can see.
if anyone else is having the problem when they get to the last dungeon and seem unable to find the last chest
go look at the very top of the map, 7 squares from the left. there's another passage over there.
bump if this helped.