50 Lives
At the main menu press B, UP, B, B, L, Y. When you start the game
your life counter will show "9, but you really have 50 lives
Refill Energy
Whenever you're low on energy during the game, press START to
pause, then press RIGHT, LEFT, X, X, X, UP, DOWN. When you unpause,
your energy will be full.
Stage Select
At the main menu press L,UP,X,UP,R,Y,START. A stage-select menu
will appear. Choose a stage with the D-pad and press start to
go there.