It's certainly on the weird side of things, but one feels challenged nevertheless... 4 Minutes and 33 Seconds of Uniqueness
You'll win the game if you're the only one playing it at the moment in the world. The game checks over the internet if there are other people playing it at the moment and it'll kill the game if someone else is playing it. You have to play the game for 4 minutes and 33 seconds.
The gameplay = you launching the game. Really. Obviously, it just got released, so getting past 2 minutes is quite the achievement right now.