Cheat Mode
Enter the following codes at the pause menu:
[Up], [Down], [Up], [Down], [Left], [Right], [Left], [Right], [Square], [Triangle], [Square], [Triangle] - Unlock Swordfish weapon.
[Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [Square], [Triangle], [Square], [Triangle] - Unlock Chainsaw as a secondary weapon.
[Right], [Left], [Right], [Left], [Down], [Down], [Up], [Up], [Square], [Triangle], [Square], [Square], [Triangle], [Triangle] - Unlock Telephone of Sorrow.
[Left], [Left], [Right], [Right], [Square], [Triangle], [Triangle], [Square], [Up], [Down] - Unlock Baby Toy Hammer.