Quest for Quintana Roo appears to have been released in tiny, tiny quantities (I'm guessing not more than a few hundred copies?) before the company went bust. I never saw it in dealer ads either, which makes it a lot rarer than Space Shuttle - Module One in my books. Should a third one appear, maybe we'll change the rating...
"10" titles are commercial programs that basically never turn up. A good example would be all the crappy JMH Software educational games added recently or stuff available by mail order only in the classifieds.
--
Atari Frog
http://www.atarimania.com