The global beta for Team Dakota's digital canvas game, Project Spark, is now open - but only for Windows 8.1 users.
The game was announced at E3 in June, and allows players to easily create games, movies, and other experiences, as well as playing other people's creations. Beta registration opened up shortly after the announcement.
The beta is currently only open to Windows 8.1 users, but will open to Xbox One players "early next calendar year", reports Polygon.
If you want to join the beta test, you can throw your name into the pool that testers get selected from by signing up at the game's official website.