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This is the best MOBA on iOS. They reduced the amount of ads (thank god, it was ridiculous). It takes a little while to get the hang of the game, but its worth it. The in app purchases are over priced, but you need not make any to progress in the game at a fair pace. They do need to continue balancing the heroes, but still my favorite game for a long time running. Try it out.
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Heroes of Order & Chaos, v3.2.0