Level select
Enter the options screen. Set "Vibration" to "1" and "Sound Effects" and "Music" to "0". Then, hold L1 + L2 + R1 + R2 + Circle + Square. If you entered the code correctly, the message "Spooky Cat" will appear in the middle of the screen.

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Game Shark Codes

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Master Code (Must Be On) EC878280 1449D2E4

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Infinite Armor 4CC1D49A 1456248F

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Infinite Ammo Weapon 1 4CD5B248 1456E788

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Infinite Ammo Weapon 2 4CD5B24C 1456E788

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Infinite Ammo Weapon 3 4CD5B250 1456E788

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Never Overheat 4CC1D48C 1456E7A5