Introducing a brand new way to build your Robo Rally Courses! The Master Builder Expansion contains new 6x6 grid boards which allow for crazy course shapes and endless opportunity. This expansion also adds Factory Floor Tokens which are individual grid spaces with various elements on them. These tokens can be placed onto the board for exciting course customization! These expansion boards and tokens are fully compatible with all existing Robo Rally boards. Tinker away with the Master Builder Expansion! Features: New 6x6 grid boards allowing unique race tracks! New Factory Floor Tokens which are individual grid spaces with various elements on them. Add new twists to your courses and connect boards in ways you never could before! 5 New Upgrade Cards! Fully compatible with all existing Robo Rally Boards.