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Question: Question about finding items which have been purchased.

I just purchased MX vs. ATV for Wii for my son and we are having difficulty finding instructions. My current question is this- he has purchased a monster truck and yet we are having to enter a cheat code everytime he wants to play because we can't find where his monster truck is. Are we supposed to save something or do I just not know where to look?

Once something has been purchased or unlocked, how do we get to it? Any help would be much appreciated!

Sincerely- Amanda