Atari 2600 version of Ixiom discovered

I have no idea how I missed this one.
Way back in May of this year, the NorthWest Classic Games Enthusiasts Expo showed off a prototype build of Sega’s Ixion for the Atari 2600. This brings the total number of discovered Ixion games to three: an Atari 8-Bit Computer and arcade version have also been found in prototype stages.
Ixion has never been commercially released on any format, although Lee Krueger of ResQSoft is looking into producing the Atari 2600 version on cartridge. We’ll keep you updated, hopefully sooner than three months after the fact. In the meantime, I’ve mirrored all of the publicized (and even one non-publicized!) screenshots of the Atari 2600 version on this page. Pardon the blurriness, Krueger saved the original emulator screenshots as JPEG-formatted images for some strange reason.