While playing, press Start then hold L and press C-Left, C-Left, C-Right, C-Right, B, A, C-Up, C-Up, C-Down, C-Down, Start.
Unlock original Asteroids, credits, and relentless mode:
At the main menu, hold L and press C-Left, C-Right, C-Up, C-Down, A, C-Up, C-Down, C-Left, C-Right, Start.
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