Pause the game and press Up 8 times, Down 4 times, Left 2 times, A, B, Right 8 times, Left 4 times, Up 2 times, B, A.
Enter the Cheat Menu code as prescribed, but before pressing Start to go to the main menu, hold Up, Right, A, B, and Select, and then press Start. Start a new game with whatever cheats you desire, then once gameplay begins pause, enter the Cheat Menu code again, and a sound will play, confirming correct code entry. You will now be invulnerable.
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