Press Up, Down, Up, Down, A at the title screen to start the game with 99 Thunder Bolts.
When you return to the title screen after a game over, hold down and press start to continue at the level you were on.
Fully Powered Up and Level Skip
At the title screen, press Up, Down, Up, Down and A. If done right, you'll have a high jump, 99 bolts, better shield and unlimited money. To skip levels, just press Up, A & B at the same time.
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