Haunting Ground

Unlock Alternate dog.
Finish the game once.

Unlock Alternate enemy costume:
Play Hard Mode.

Unlock Cowboy Costume:
Finish the game once.

Unlock 'Illegal in some states':
Costume Finish the game once.

Hard Mode:
To unlock both hard mode and the secret room beat the game once.
They will be selectable from the main menu.

 