Unlocks:

Sonya Express mode
Successfully complete the game under the normal or hard difficulty setting to 
unlock Sonya Express mode. This game allows you to play the game as Sonya at 
double speed while wearing a waitress costume. 

Wheel Of Fortune mode
Successfully complete the game in Sonya Express mode. 

Get All Guns
Go To The Main Menu and Press left, right, up, up, down, left, right, black, white. Now you Have All Guns.