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The same may also apply to the GC pad, as it also has a Z button, but in a different place.
The only real succesfull gun we had was the NES gun, for games like Duck Hunt, and the SNES one looked good, but wan't really all that good in the end. Did you also notice how similar the SNES gun looks to the one used in the Mario Bros. movie!!
I don't think we need guns anymore, as you cannot move around with them, as you usually move automaticlly.
They'd be good for training modes like the one in Perfect Dark, but you wouldn't be able to use a pad to look around at your own free will.