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Using only symbols available in the "ascii" set of characters

Featuring aesthetics, gameplay, or themes reminiscent of classic video games. Often characterized by pixel art, chiptune music, or mechanics popularized in earlier gaming eras.

Near infinitely replayable games that usually feature, random generation, perma-death, and brutal difficulty. 

Focused on using its text, moreso than its visuals or audio, to tell the bulk of its story/plot. (Still can have great audio and visuals, though!)

Resources for building and relating to User Interfaces, how the user interacts with your program