Windows 8.1 users are now able to sign up to the beta of game creation tool, Project Spark.
Head over to the game's official website where you can enter your email to request a spot in the beta. You'll then receive an email informing you that Microsoft will "be in touch as soon as information about our Beta Test is available".
The email notes that the Project Spark Facebook page will be updated with the latest developments on the project.
A beta was originally planned for October, with an Xbox One beta also expected in January.
Check out gameplay from the beta in the archived Twitch stream below.