The Witcher Enhanced Edition is available for free on GOG for those who have played the Gwent: The Witcher Card Game beta. The beta is actually still able to be registered for currently, so this offer isn't completely sealed off.
Gwent: The Witcher Card Game is a stand-alone version of the card game featured in The Witcher 3 Wild Hunt. It's similar to Hearthstone in the way matches are played and is currently in beta awaiting full release.
Those who have participated in the beta get a free copy of The Witcher Enhanced Edition on their GOG account after playing the beta. For those looking to get a free copy, or just a chance to play the beta, go to GOG and sign up now, then register for the Gwent beta on their website.
