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Typically a graphical style where there are one two colors. (A bit can be either on or off, so two options) Commonly black and white, but can be any combination depending on the style the creator is trying to accomplish. 

Offering a calm and soothing experience, often with minimal pressure or stress. Relaxing games typically feature peaceful environments, gentle soundtracks, and low-stakes gameplay designed to help players unwind and de-stress.