I am looking to find out if solo RPGs exist, and which you'd recommend.
I do not mean "one-on-one" 1 player + 1 GM games. I really mean "1 person."
Update: After receiving two (fine, up-voted) answers that indicate Choose Your Own Adventure solutions (which rocks with nostalgia), I should add that I'm not looking for simple linear decision tree gaming. A counterexample: I've got my own little creative-writing mini-game where I write out a story, but once every 5 sentences a series of dice-rolls forces my written sentence into something else, and I have to adapt as writer. Not really an RPG, but also non-linear.