Halo 2600 (2010) condenses the essence of the Bungie/343 Industries saga — a soldier facing aliens in a hostile setting — into a cartridge of just 4 kilobytes, as a style exercise in how much can be achieved on the oldest hardware with today's ideas. It's one of the most celebrated pieces of the modern homebrew scene, not just for its quality but for the irony that one of the people behind Xbox's success spent time programming for the console that Xbox would go on to commercially surpass decades later.

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