A good friend of mine is fond of stories involving time travel. I enjoy the odd time travel story too, but it's difficult to pull off a time travel story that isn't a bad re-hash of something that's been done before, or something incredibly confusing involving paradoxes and multiple instances of the same person.

However, there is a fantastic game that bends your mind as far as thinking in terms of solving problems through time travel. It's called Chronotron.

Try it!