 In order to facilitate the creation process and to accommodate any mistakes made, the editor features a manipulatable time system, whereby the player may "rewind" the editor, which acts as an undo feature, or pause the editor, which temporarily halts objects that run under the physics engine, such as gravity acting on falling or rolling objects.In addition to his narration for other parts of the game, Stephen Fry provides the voice-over for the large number of video and interactive tutorials that accompany the create mode, a number of which must be completed in full before unlocking a new set of objects for use.User-generated content is not limited to the player's region, but is available worldwide.