CD Projekt Red confirms that a standalone game based on The Witcher 3‘s card game is in the works, with Gwent: The Witcher Card Game set for a closed beta test in September.

The cryptic announcement that CD Projekt Red was expected to make was one of the most intriguing aspects of the build-up to E3 2016, and now the mystery has officially been solved. The developer has confirmed the existence of a standalone game based on the Gwent minigame of The Witcher 3. Titled Gwent: The Witcher Card Game, the announcement of the game backs up the leak of the project that appeared last week.

As it turns out, this version of Gwent is going to be fairly different from the one that appeared in The Witcher 3: Wild Hunt. The title is going to include cross-play, to allow users on different platforms to play against one another, while the game will also see improved core mechanics and redesigned visuals. Meanwhile, although the game is promising to be a strong multiplayer experience, it will also include a single-player mode.

CD Projekt Red also confirmed exactly when gamers can expect to get their hands on the new-and-improved Gwent for the first time. As it turns out, the card game spin-off is going to be entering a closed beta this September, available first on Xbox One and PC, and gamers are able to sign up over at the official Gwent: The Witcher Card Game website. Those who want another look at the trailer that debuted at E3 2016 can do so by checking out the video below.

Exactly when the game will see full release, however, remains to be seen. The full extend of the game’s platforms is also a mystery at the moment, with only Xbox and PC announced at this point. Although it remains likely that a PS4 release will see the light of day, whether the game receives cross-platform play between consoles is another matter entirely.

This side game was perhaps one of the worst kept secrets in the run-up to E3 2016, with many comments from CD Projekt Red pointing towards the existence of the game. The developer teased the prospect of a new game at the expo several weeks ago, while it also said that it wanted to return to the Witcher franchise in some way, shape, or form. By the time a giant Witcher poster appeared on the side of a Los Angeles hotel, many gamers had already put two and two together.

Gwent: The Witcher Card Game is not the only card game spin-off from an acclaimed fantasy RPG series that has appeared over the course of E3 2016. The Elder Scrolls franchise is also getting a card game, in the form of The Elder Scrolls: Legends, and the long-awaited title could prove stiff opposition for Gwent: The Witcher Card Game. Then again, given that Gwent is already a popular game in its own right, the smart money might be on this spin-off being a real success.

Gwent: The Witcher Card Game will be entering a closed beta in September, with a full release coming at a later date.