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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. 

A gift-giving holiday celebrated on December 25th around the world, Christmas-themed works often incorporate depictions of snow, presents, or nods to its red and white-clad figurehead, Santa Claus.

Focused on imparting a skill, lesson, or piece of information to its player that would be helpful to them in other aspects of life, such as a faster typing ability or knowledge about a period in history.