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How do i use multiplayer> Ive unlocked it, but dont know where to find it!

goto load game (and load a game) and scrool through till you find the stage multiplayer... it sucks. you cannot use focus and thats when all the cool stuff happens

yea scroll to the left when u r selecting a level

That is, assuming you have the Xbox, PS2, or GCN version. Scroll all the way left as if you were selecting a previous level to be loaded

Hmmmm... I did all that, the Code was successful, I load and it only goes up to the post office thing, and I cannot go back to previous level.... can anyone help?

Do you have a second controller plugged in? If so then it should work on the far left on the save you hacked. Unless you used a cheat to open it... in which case you might need to hack it again.