Mysterious Adventures were a series of 11 adventure games written by Bryan Howarth, using the same technology Scott Adams used for his Adventure series. They were published mainly for UK computers making them relatively rare and unheard of in North America. They were published by quite a large number of companies over the years resulting in a large number of packaging variations. Initially the first few were sold under the company Molimerx. Shortly thereafter, the first few games were sold by a company called Acorn, for TRS-80 computers. the first company to publish all 11 games was Digital Fantasia, which produced large boxed versions of the games. Following this, Channel 8 sold then in a nice wallet format. And lastly, numerous budget releases came about - Paxman Promotion, Dixon's Pack, and Tynesoft all published all 11 games as well. As you can see, these are by far the most published and re-published games in computing history probably!