The game auto saves after each trial or level u do and i got the all units unlocked badge even tho im missing 4 units on page 2 and 1 units on page 3 so...wtf?
I think once u max out ur units/heros skills there should be a equipment slot upgrade thats costs 1000 exp becuase after u max out everything exp is completly pointless
To defeat the inferno have to move ur units in front of him becuase if u dont he will keep on going threw them and ur units will keep on going without going back to attack him so u need alittle movements in that level
i defeated the coulses using ranged units all u do is have the dragon with u and a unit that respawns quickly and goes to the coulses quickly he will keep on attackign that units and use rage spell from the dragon to increase the ranged units attack and by the time coulses gets near ur hero it will be almost dead
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