So Blizzard has just made both The Lost Vikings and Rock n' Roll Racing available for free. I had The Lost Vikings for the Genesis as a kid, and I remember my cousins and I swapping passwords over the phone whenever one of us would advance past a particularly tough level. Hopefully it holds up well.

https://us.battle.net/account/download/

http://www.blizzpro.com/2014/05/02/download-blizzard-classics-the-lost-vikings-and-rock-n-roll-racing-for-free/

Edit: Fixed link.

The Lost Vikings is still spectacular. I played through it not that long ago.

Free is pretty great! The Lost Vikings was/is awesome, if you have never played it you should get on this. Maybe I can finally finish it.

Already a thread.

@shagge: Oops. I overlooked that. Sorry.