Codes

Secret Outfit - This code is entered at the "Press Start" screen. After Entering you should hear the sound of a page turning

Code Effect - up, up, down, down, left, right, left, right, O Unlocks the Young Alex Costume

Unlockables

All 5 endings *SPOILERS* - Here's what you need to do to get all 5 endings.

Unlockables

Bogeyman ending Dont forgive his father, dont mercy kill mother, and then don't save wheeler.
Drowning ending Dont forgive his father, and mercy kill his mother
Good ending Forgive Alex's father and show his mother mercy by killing her.
Hospital ending Forgive his father and do not kill his mother.
UFO ending (you knew it was there) mustn't forgive thy father or mercy kill thy mother, but must save Wheeler.

Alternate Costumes

Unlockables

Bogeyman Helmet Obtain the "Bogeyman" Ending
Deputy Alex Obtain the "UFO" Ending
Order Soldier Outfit Obtain the "Drowning" Ending
Orderly Alex Obtain the "Hospital" Ending
Trucker Alex Obtain the "Good" Ending

Unlockable Weapons - To unlock these two, just beat the game once, and follow the steps.

Circular Saw(used by curtis) On your Second play through, it is found in the Shepherds family garage.
Lasor Pistol In a subseqquent play though, it is found in Joshua's room on top of his foot locker if you obtianed the UFO ending