In a bit of a Doctor Who mood, I've always had a soft spot for our particularly British slice of fantasy, I find it hard calling it science fiction but I guess that label fits for TV purposes.
I've always thought the whoniverse would make a great setting for solitaire adventures, since the adventures can go anywhere in time and space which gives plenty of scope for random creativity. Seems I wasn't the only one, in 2009 a chap named Simon Cogan released the free Doctor Who: Solitaire Story Game into the wild, and it has been not so gradually expanded over the last few years to contain a huge amount of material. It really is a labour of love from an obvious fan of the series, the amount of work that has gone into these books and expansions is quite unbelievable for what is a freely available game.
I'm not going to go into much detail here, but to give you an idea...
It's a numbered paragraph system split across four core books, rules, adventures, enemies, and events. During the game you will go to locations in the adventure book, perform one of a number of actions, roll for encounters which may lead you to the event book, or to a fight using the enemy book, you'll resolve plots to complete adventures, meet characters, gain and lose companions, and that's just what I can remember right at the moment. If you ever played the old game Barbarian Prince, you may see some similarities since I think there is some connection there at least in inspiration. The rules book will lead you through the system, but there is a great community at the game's yahoo group if you do need to ask any questions.
The game can be played using just those four core books, some d6 dice, and pencil and paper; although I've taken to using PDFs on my computer, dicetool, and Microsoft Onenote for this sort of thing so I may do that to speed things up a little.
Next post on this will be some sort of session report or review, and since I'm on a Doctor Who kick there are a couple of other ideas I have floating around so they may turn up too.