NBA Jam Cheats for XBox
Press the following at the "Enter Cheats" screen: X, A, B, UP. If done correctly, 'Challenge Mode' will appear at the top of the screen to confirm.
Press the folloing at the "ENTER CHEATS" screen: X, A, B, LEFT. If done correctly, 'CHILDS PLAY' will appear at the top of the screen to confirm.
Type in the name 'CREDITS' as a user profile and you will get the five developers teams which all have excellent stats.