Big O (Ferris wheel)
Big O has a diameter of 60 metres (200 ft), and was listed as the world's largest centreless Ferris wheel by Guinness World Records in 2006. Joysound karaoke machines were added to eight of its forty gondolas in August 2017. Tokyo's largest roller coaster, the 130 kilometres per hour (81 mph) Thunder Dolphin, passes through the centre of the wheel.
- Guinness World Records 2007 (2007 ed.), Guinness World Records Limited, 2006, p. 205, ISBN 0-9735514-4-5
- Romano, Andrea (September 7, 2017). "You Can Sing Karaoke While Riding This Japanese Ferris Wheel". Travel and Leisure. Affluent Travel Group. Retrieved 30 March 2018.
- Murphy, Meg (26 July 2017). "Take your singing to new heights on the world's first karaoke Ferris wheel in Tokyo". Japan Today. GPlus Media. Retrieved 30 March 2018.
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