I came across one of these at a Doc's used game store like 7 years ago for maybe $120 or $130 and the owner told me about some cool games where you could squares that are rotating in circles and somehow made it seem very interesting. I spent the last week or so going through Youtube videos on all manner of retro consoles like Channel F, Astrocade, Arcadia 2001, Coleco Telstar, Coleco Gemini, etc. I thought APF sounded familiar when I saw that on Wikipedia but was only led to APF TV Fun which didn't have that game. Finally came across John Hancock's video on APF MP1000 and found it from there.
Anyway, who wants to sell or trade or do a combination for one? I have a Vectrex homebrew called Sundance that is worth over $100, Diner for Intellivision, bunch of boxed Intellivision commons, Tempest 3000 for Nuon, and some other cool stuff.