Chainsaw:
     Find the hidden Chainsaw weapon. Once you beat the game on Normal
with  Normal puzzle difficulty, start a new game and the chainsaw will
be hidden in the logs before the cemetary.

Extra Mode:
     Beat  the  game for more options. Once you complete the game, you
can  find  several  new  options  in  the Options menu, such as Bullet
Adjust  (2  or  3  times  the  normal ammo supply), and an option that
allows you to deactivate the noise filters in some scenes.

Extra Puzzle Difficulties:
     Once  you've  beaten  the  game  using the Easy, Normal, and Hard
puzzle settings, you will find that playing a new game under Hard mode
gives you new puzzles.

Hyper Spray!:
     Another  new  weapon? Beat the game twice, then start a new game.
Enter  the  motor  home  on  the southern side of the town and nab the
Hyper Spray.

Visible Signs:
     Reveal  All  Hidden  Signs. Once you've opened up all five of the
game  endings,  you  can  begin  a  new game and all the signs will be
viewable.