Get Normal Mode
Go to the codes screen in the options menu and press Up, Down, Up, Down, Up, Down, Up, Down, Up, Down.
More Items
Go to the codes screen in the options menu and press Right(5x), Left (3x), Up, Up.
Get Difficult Mode
Go to the codes screen in the options menu and press Down, Up(8x), Down.
Get Easy Mode
Go to the codes screen in the options menu and press Up, Down(8x), Up.
Get Old Soul Super Weapons
Go to the codes screen in the options menu and press Right, Up, Down, Down, Up, Right, Right, Up, Down, Down.
More Special Features
Go to the codes screen in the options menu and press Left, Down, Up, Left, Right, Up, Down, Left, Right, Down
All levels
Go to the codes screen in the options menu and press Down, Left, Left, Down, Left, Down, Right, Down, Left, Down
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