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Sony PSP - Frantix cheats

Cheat mode:
Go to level selection screen. Press L + R at to bring up 
the code entry screen. After, use the D-pad to enter one of 
the following codes. Press X to activate the cheat codes.

Effect - code:
Stage select - Enter LVLANY1 
Disable stage select - Enter LVLANY0
Toggle Invincibility - Enter INVINC1
Disable invincibility - Enter INVINC0