Isn't Hachi a purchasable character in the original Advance Wars? Advance Wars
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I may be misremembering something... but I'm sure I had bought Hachi as a playable CO in the original Advance Wars (European version). I remember using the map editor glitch to get loads of coins and buy everything, after clearing all the War Room maps and the hard campaign... and then Hachi offered his own services for sale. However, I don't see any of the FAQs mentioning this.
Am I imagining things?! I did play the other two Advance Wars games, but I'm sure not nearly as much as the original one.