Unlock Chain Saw:
Complete the game on Normal difficulty with the normal puzzle difficulty settings and when you then start a new game the chain saw will be among the logs before you get to the cemetery.
Unlock Hyper Spray:
Complete the game twice and start a new game and the Hyper Spray will be on the south side of the motor home.
Unlock Extra Options:
Press L1 + R1 at the 'Options' screen to display an extra options menu with map zoom, blood color and other selections.
Unlock Additional Puzzle Difficulty:
Complete the game on the Easy, Normal and Hard puzzle difficulty settings and then select the Hard puzzle difficulty again and the new game will have different puzzles for you to solve.
Added by: Sanzano Jan 14th 2008, ID#28853