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    I remember implementing the flags for this bit in the PPUMASK register in my NES emulator, but never actually integrated it into the graphics rendering.

    I always wondered if I would ever need to come back to it…

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      It is quite an exaggeration to call a grayscale bit in some register a “secret game boy mode”. I would’ve expected something more fundamental to be changed.

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        The presenter admits the title is a bit clickbaity, but it’s all in good fun I think.

        I think it’s interesting that the grayscale bit is basically completely unused, save for one game released only in Europe.

        And I enjoy the whimsy of turning on grayscale mode and the “enhance green” bit and having it look not unlike a Game Boy.

        But the obscurity of it, even in the system’s prime, is what interested me.