If you were around in the 1980s you may have had (or had access to) a Sinclair ZX Spectrum. What a terrific little machine it was too. And one of the most addictive games of the era was Manic Miner, a simple 2D platform game that took Spectrum owners by storm.
Well the very excellent Richard Costall has built a version of MM in Silverlight, and it’s great fun to play. It certainly takes me back to my (very young at the time) youth ;-).
Take a look at http://www.nxtgenug.net/manicminer/ and have a go at a gaming classic.