What one game would you keep if you're stuck all alone on an island?

[Bloo]

I would probably play a lot of text based/basic graphic MMORPG's and since wow can quite easily be run on dialup with pretty much most of the bandwidth to spare I'd play that if there was nothing else.

The idea is that you're all alone and have on PC game to starve off boredom, since otherwise you could just pick a MMORPG and have hours of fun with other people.