Unlock Ending Bonuses:
Earn gameplay ranks which are based on the amount of time it took for you to finish. Below are listed the ranks and what they unlock

D (9:01 or more): Leech Hunter and Closet Key.

C (7:01-9:00): Leech Hunter and Closet Key.

B (5:01-7:00): Leech Hunter and Closet Key.

A (3:31-5:00): Submachine Gun, Leech Hunter, Closet Key.

S (3:30 or less): Rocket Launcher, Leech Hunter, Submachine gun, and Closet Key.


Unlock Leech Hunter Game:
Beat the game on either Easy, Normal or Hard mode. Unlock Extra Weapons for Leech Hunter:
In the Leech Hunter mini game earn a ran to receive bonuses to use in the game. Below are the rankings and what they will give you

E (1-29): Submachine gun bullets

D (90-99): Handgun

C (60-89): Hunting Gun

B (30-59): Magnum

A (100): All weapons


Unlock New Costumes:
Complete the game on Normal or Hard Mode to find the Closet Key in Rebecca's inventory when you begin a new game. Take this to the room where you got the Hunting Gun and use it to get into a costume room. Billy gets a suit and Rebecca gets either leather or cowgirl apparel.

Unlock Extra Weapons for Leech Hunter
Rankings in the Leech Hunter mini-game and the bonuses you get.

E (1-29) - Submachine gun bullets
B (30-59) - Magnum
C (60-89) - Hunting Gun
D (90-99) - Handgun
A (100) - All weapons

Unlock Ending Bonuses
Unlock Ending bonuses by earning gameplay ranks which are based on the amount of time it took to finish. The following are the ranks and what they unlock.

S (3:30 or less): Rocket Launcher, Leech Hunter, Submachine gun, and Closet Key.
A: (3:31-5:00): Submachine Gun, Leech Hunter, Closet Key.
B (5:01-7:00): Leech Hunter and Closet Key.
C (7:01-9:00): Leech Hunter and Closet Key.
D (9:01 or more): Leech Hunter and Closet Key.

Brake System Puzzle:
The main code is 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 7 + 2 = 81. This will
activate the brakes for the train.