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Just use gameshark. It's a place where you you can find LOTS AND LOTS AND LOTS of cheat codes for super Mario 64.
yes there is action replay codes just look it up on codejunkies.com
Um I don't but if you buy AR DS theres lots of codes like playing as peach or bowser if that's what your talking about
i personally don't know any ( i live in USA ), but there are lots at codejunkies.com. click UK codes from Adam the great gamer
you need to hack using homebrew channel. there are lots if download links on youtube. for codes go to http://www.volderbeek.freeforums.org/
there are lots of different hacks like item, moonjump and auto win. for most hack codes go to http://www.volderbeek.freeforums.org
Mario Construter Forever has a lots of items then Mario Worker
Watch Disney and they will give you lots of codes.
lots of wires metal and speacial compasters
lots
Lots and lots of people
i know there is lots of codes but i only know one that is earth88