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PICO-8 is a fantasy console powered by Lua. Games are distributed as cartridges which double as PNG  images. 

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

Products that involve or comprise source code, including programming games; does not refer to products with their own source code available, open source or not.