Q*bert (PlayStation)

GameShark, Pro Action Replay, Xploder, and Xplorer Codes

Note:
A GameShark or Pro Action Replay cartridge is required to use the codes featured below.

North American (NTSC) version

Maximum score:
80146A28 FFFF

Unlimited lives:
30146A35 0003

Unlock all levels and maximum score:
50003504 0000
80145D9C FFFF
All codes above from deets.

Official codes from InterAct.
Codes from The Game Shark Code Creator's Club.