50 Extra Lives
At the screen where you select which game you would like to load, press these buttons: B, A, R, R, A, L and you should hear a noise. Once you enter the game, you'll notice that you'll have 50 extra lives.
P.S. This is kinda wierd, but if you play the very first level of the game, jump on top of the cave that exits the level, and run to the top of it. Just hold right on the D-pad and jump over and over, and if you do it right you should get 5 free lives. If it doesn't work, sorry, you're doing something wrong.
Hope I helped any classic gamers!!
Added by: Villa Killa Jul 3rd 2008, ID#38