Limbo was probably my favourite game from 2010, and whilst it was critically acclaimed for it's beautifully dark and minimalist presentation, it did get some criticism from for the amount it cost (1,200 points) vs the play time with many reviewers saying that 800 points would be a fairer value. Well, it now is 800 points, so take a look.
http://www.dealspwn.com/limbo-800-ms...live-xbox-360/
I recommend playing it in a dark room with the sound turned up for a truly spooky experience