PICO-8 is a fantasy console, a small computer program that emulates a video game console that never existed. It focuses on allowing users to both create and play video games as part of a single experience, with the Esc key switching between the two modes.
It intentionally calls back to retro aesthetics with a 128x128 pixel screen, only 16 different colours, and a fairly limited maximum game size. However, it simplifies actually creating games, opting to use a stripped-down form of Lua for game code, as well as integrated sprite, map, sfx, and music editors. Games can be exported to all popular operating systems and very easily embedding into webpages. The end result is nice retro experiences that are simple to create and share with others.