Go into a level with the dragons, hit them, jump over them twice, and run. It will give you more experiance. Press and hold L,R,X,Y,A,B, and then WHITE (with either player). This will give you 45 level up points and $500,000. To use this cheat multiple times you have to save, turn off the console, turn on the console, then load the game and use the cheat again.