The following are known Action Replay Codes for Crash Bandicoot 2: Cortex Strikes Back on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

All Crystals
8006D03C FFFF
8006D03E FFFF
8006D040 FFFF

All Gems
8006CEC0 FFFF
8006CEC2 FFFF
8006CEC4 FFFF
8006CEC6 FFFF

Open All Levels (Note 2)
80069160 FFFF
80069162 FFFF
80069164 09FF

100 Lives (Note 1)
8006CE68 6400