Project Spark starts today on Windows 8.1 Microsoft and Team Dakota's ambitious game creation tool, Project Spark, can now be beta-tested by everyone using a Windows 8.1 system. Project...

Microsoft and Team Dakota's ambitious game creation tool, Project Spark, can now be beta-tested by everyone using a Windows 8.1 system.

Project Spark will allow players to create their own worlds and populate them with a number of creations. A visual scripting language will let advanced players create new AI behaviors, enabling dedicated creators to make their own games, movies, and more within Spark.

Windows 8.1 users can sign up for the beta here. Xbox One players will be able to join "early next calendar year." The game is also coming out to Xbox 360.