Unlock Cheat menu
Pause game, hold L and press C-Left, C-Left, C-Right, C-Right, B, A, C-Up, C-Up, C-Down, C-Down, Start.
(Thanks to tghy@yahoo.com)

Unlock Original Asteroids, Credits, and Relentless Mode
Pause game, hold L and press C-Left, C-Right, C-Up, C-Down, A, C-Up, C-Down, C-Left, C-Right, Start.
(Thanks to tghy@yahoo.com)

Unlock Original Asteroids Mini-game
Reach Zone 1, Level 15, then locate and shoot the green vector graphics asteroid that appears to unlock the classic Asteroids mini-game.
(Thanks to tghy@yahoo.com)

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