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@cedric: 1. there are no 'towers' 2. of course its going to be hard if you dont know how to upgrade 3. protector 2 has the same upgrade system as 3, the only difference is 3 has acheivements
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for roundabout, start by placing two wizards on the closest square to the entries and one warrior in the middle
then place four more wizards, two next to each side of the warrior, as close as possible
now upgrade: (I would only use fire)
mages: infect-slow-debuff (infect for those close to the entry), specialise them (specialism, inflictor, large increase...)
warrior: generalise as much as possible, and make him an archer
I hope this helps
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aztec801 put 1 fire mage inside and 2 wariors, 1 fire and 1 energy, change them in archers later,
if anyone knows how to beat "mountain fire" tell me please :F
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@crystal: if by characters you mean heroes, you must buy them at the tavern. if you mean basic units, then you simply buy more