The Witcher is currently free via GOG, and all you have to do to get it is play some Gwent. Or rather, install Gwent, sign up for a newsletter, and get both the Witcher and a free card keg.
Geralt may be more famous for his most recent adventure, but the original Witcher is no slouch, either - provided you’re able to power through an experience that’s a bit rough around the edges. Geralt’s digital debut is still a fabulous game, filled with all the grim choices and ugly role-playing you could hope for. (I’m honestly not sure I could take another trip through that swamp, though.)
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If you’ve ever installed Gwent (it’s free, and you can grab it here), you can hit the sign-up page to claim your reward. Doing so will add a free Gwent Card Keg to your library, and will make the Witcher: Enhanced Edition free on its store page, allowing you to either claim the game for yourself or gift it to a friend.