Microsoft is launching a beta version of Project Spark on Tuesday, its game-maker project for Windows 8.1, Xbox 360, and the new Xbox One console. Project Spark is essentially a tool to allow developers, enthusiasts, and gamers to build a game within a game. Players can build custom worlds, characters, and animations from an Xbox One or a Windows 8.1 PC to play across both platforms. It’s similar in concept to Sony’s LittleBigPlanet, but Microsoft is making use of its history with Kodu and pushing SmartGlass integration to allow players to interact with their games and collaborate from a tablet while they build and play on an Xbox One. Project Spark offers gamers a number of ways to create games and edit them. The simplest method lets you pick a world type, character, and mission before being thrown into a dynamically generated world where you can begin playing or continue editing.