Part Minecraft, part Little Big Planet, Project Spark that brings user generated content to the Xbox One and Windows 8. A demo was shown off at the Microsoft press conference, demonstrating how you can make your own game using only your voice and Smartglass.
"Spark! Show me rivers! Make that mountains!" the developer yelled, and the world obliged. "Night! Evening! Day! Four o'clock! Perfect," he said, and everything moved and warped. Later, they showed off adding a "brain" to a creature, demonstrating the pieces needed to create a game. Other levels shown off were third-person platformers, racers, and arcade games.