If you've yet to experience CD Projekt RED's RPG series, you'll be able to jump in for free this weekend on Steam. Both The Witcher Enhanced Edition and The Witcher 2: Assassins of Kings will be free to play until Sunday, 1PM PT.
Of course, these being lengthy RPG adventures, this is probably the meanest free weekend on Steam yet. Be prepared to start a journey... and come nowhere near finishing. Thankfully, both games will be on sale for 80% off until February 18th--a brilliant play by CDPR to get people to get hooked on the franchise before the launch of The Witcher 3.