Gwent: The Witcher Card Game is a 2018 digital collectible card game by CD Projekt. It was released free-to-play first for Windows, PlayStation 4, and Xbox One in 2018, and for iOS in 2019, Android in 2020, and macOS in 2021. From Wikipedia
The milestone includes game discounts, live concerts, new merchandise, and a preview of The Witcher 4 featuring Ciri as the protagonist.
