Activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Secondary weapon is a chainsaw - Pause game play, then press UP(2), DOWN(2), LEFT, RIGHT, LEFT, RIGHT, SQUARE, TRIANGLE, SQUARE, TRIANGLE.
Baby Toy Hammer - Pause game play, then press LEFT(2), RIGHT(2), SQUARE, TRIANGLE(2), SQUARE, UP, DOWN.
Telephone of Sorrow - Pause game play, then press RIGHT, LEFT, RIGHT, LEFT, DOWN(2), UP(2), SQUARE, TRIANGLE, SQUARE(2), TRIANGLE(2).
Swordfish weapon - Pause game play, then press UP, DOWN, UP, DOWN, LEFT, RIGHT, LEFT, RIGHT, SQUARE, TRIANGLE, SQUARE, TRIANGLE.