If you have a solo roleplaying/storytelling itch that needs scratched, you should check out the Doctor Who Solitaire Story Game. It is free and very good. This is my personal favorite for solo roleplaying. There is a lot of material already available for the game and the author has more scheduled through 2014. You don't need to be a Doctor Who fan to enjoy the game, but you may become one if you start playing. They also came up with a pretty clever idea on an alternate way to play the game. They created a wiki that links everything together and included Doctor Who imagery and sounds to assist in setting the environment, complete with die roller. I can play this game entirely on my iPad if I am on the go too. You can get everything you need to play the game here, and the wiki is here.