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Jump Ultimate Stars. Not even close (the next closest is Pokemon, which I have probably put 1/3 the amount of time into). But yeah, Jump Ultimate Stars is an amazing game and I have probably played 3245 online games in it so far (either against friends or random Japanese kids). It's totally addictive. The only barrier is that it's in Japanese, but a nifty gamefaqs guide solves that pretty quick and you just get lost in it.