Build a 5.6 meter, marble roller coaster with the colourful Space Rail level 2 - 2nd Generation construction set. Use the included guide to connect rails through a network of twists, turns and loops and then reconnect back to the battery-powered elevator. When built, a steel marble is dropped allowing gravity and the Space Rail roller coaster set to send the marble on it's journey. When the journey ends, the steel marble is collected at the base of the elevator and lifted back to the top where it's released again for it's next journey down. Adjust the pitch and you control the descent/speed. It's fascinating to watch and loads of fun to build. An easy to follow English instruction manual is included.