Not much to this one. You sit across from a man and you play Russian Roulette until one of you is dead.
It's a simple premise, but the fact the game is so damn empty makes it a lot creepier than it should be. All you need to do is hold down the space button until the trigger is pulled, then either breathe easy or... stop breathing.
For some reason it reminds me of Mean Streets. Which is never a bad thing.
If you can spare 128MB, you can try Roulette out here.