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Might be worth renting it at least once to see how he does with it. It might still be a good purchase, but I think it would be hard for most of us to say. It's much more like the old 16-bit era games, and no more complicated than Sonic Adventure... but it's still certainly more complicated than the originals.

No worries guys, my mum ended up buying it for him for Christmas anyways. I'm sure he'll enjoy it more than Sonic Unleashed, purely because it sounds like a much better all round game. I'll make sure he uses a Gamecube pad too, and that should make it easier for him.