Difficulty in porting it I'd imagine - 360 and PS3 are pretty similar, PS4 and X1 will be pretty similar to each other as well, Wii U is very different.
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Its not hard to port a game that just a lame excuse.
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When you're making [b][i]four[/i][/b] versions of the same game making one for a very different system could well be hard.
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Lol false.