to get three stars in all levels, there's a slight glitch, you can move the healing potions around. so what you do is every time you find health potions, move them with you as you progress. by the time you reach the bosses, you'll have 6 or 7 health potions with you on the screen. when the heros health gets low, use the potions. you'll beat the boss without losing a single hero. three stars guaranteed =)
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