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I don't think every way to complete a map that wasn't intended by the author should be considered a bug. I shouldn't have to read the author's mind and figure out how I'm supposed to act. I have the right to use all the possibilities that the map gives me. The ability to redeem Mr. Fat – that's not a bug; the game allows you to buy heroes in the tavern. Buying a hero in the tavern is obviously not a bug; it's one of the key features of the game, and there's no reason not to use it. There are bugs in the game that are real bugs and clearly not intended by the developers. For example, the Admiral's Hat bug. I agree that this is a developer error; the hat is clearly not intended for that purpose, and using it isn't entirely fair.