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1-gamma-attack-atari-2600-20000-50000

The gamma attack cartridge.

This Atari 2600 game is arguably the rarest video game available.

Only one cartridge was produced by gaming company Gammation, and it currently is owned by collector Anthony DeNardo, according to RacketBoy. DeNardo has listed the cartridge on eBay before, asking a $500,000 Buy-It-Now price.