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Games which seek to lead the player on a journey through an uncertain and challenging world.

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. 

For that old school look and feel.

Games where the primary goal is keeping the player character alive under harsh circumstances such as dwindling resources or a hostile environment.