Psychonauts For £1! PSYCHONAUTS FOR £1!
You need no more information than this. Until Thursday Steam has one of the loveliest games ever, Psychonauts, for £1. It's hilarious, it's so beautifully written, and it's bursting with invention and ideas like nothing else. And if you want to complain that the platforming is often a bit dodgy, I reply with: IT'S ONE POUND. A pound.
A pound. (Or two dollars.)