Q-bert

Cheat Codes:
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Enter these on the designated password screen from the Main Menu:

Code       Result
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VGKKNXUK - All Weapons
AAUGSZZA - Extra Lifes
SZNUIYVG - Infinite Lifes
SXSTYNVK - Sustain no damage from bullets
VTNZXVVK - Sustain no damage from spikes

Unlock Ranks:
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To see your rank, on the Main Menu, Q*Bert will be standing on a cube 
with a number on it. That number is your rank. If you're rank 1, you 
can't step on any "special" cubes. If you're rank 2, you can step on 
cubes with a 2 on them. If you're rank 3, you can step on cubes with 
a 3 on them. You begin with rank 1.

Rank 2 - Get a score of 60,000+
Rank 3 - Get a score of 100,000+