To celebrate the launch of Amnesia: The Dark Descent on OnLive today, the cloud-gaming service is offering a scary good deal until midnight ET tonight: Simply enter "THANKYOU" (all one word) in the "Redeem Promo Code" field in the checkout window and you'll be granted a full PlayPass for the game at no charge. In other words: Free game!

The catch? Actually playing Amensia could end up costing you your sanity.

[Thanks, Barney]

This article was originally published on Joystiq.