[D.B. Cooper]

Interesting story. Never heard of Zygon.

The weird thing about Kamikize/Astro Invader is that at least in North America, Astro Invader is the much more popular game but for reason Kamikaze is listed as the parent. For Arcade games, TG only tracks Astro Invader which makes it unique in that they usually only track the parent. This is just an unusual situation but I don't blame RU for not wanting to have all the different rom versions of games.