Unlock monochrome mode:
To change the graphics to black and white, type the following cheat code
to the Code entry screen at the options menu: "9DE5"
Different Colors:
To change the saturation and hue of colors, type the following cheat code
to the Code entry screen at the options menu: "B6FC"
Unlock Sketched Graphics:
To change the graphics to high contrast black and white type the
following cheat code to the Code entry screen at the options menu: "A8D7"
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