Cheat codesDuring gameplay press L1, R1, Select and Start at the same time to return to the title screen.
Bonus Riddle Mode
Beat the game using all three Riddle Difficulty settings to unlock a fourth difficulty.
Once you beat the game you will find new options in the Options menu including Bullet Adjust (gives you twice or three times bullets when finding ammo - say for example you get a dozen bullets, if you set it to x2 you would get twenty four) and an option that lets you turn off the noise filters.
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