Perhaps you know 1KM1KT, an excellent site that publishes new free roleplaying games on a regular basis. Today they made Inquisition available, a solitaire game set into the Warhammer 40,000 universe. The game was created by Neuicon and Sean Daniels and it’s available as PDF download.
Inquisition: Purge the Unclean is a solitaire game, taking place in the Warhammer 40,000 universe. In this game, you’ll be taking on the role of an Inquisitor; your mission is to eliminate all threats that occupy an underground base in Hive World Golgotha XVII.
In order to play Inquisition: Purge the Unclean you’ll need a few six-sided dice, these rules and some scratch paper to track the Inquisitor’s attributes and any other information.
The complete game fits one page and although I haven’t tried it out yet, but it seems to be an interesting past-time.