According to Official Guinness Records,
With an amazing line tally of 4,988, and the highest possible score of 9,999,999, American gamer Harry Hong was crowned “Tetris DX Marathon Champion” on 13 September 2007. The record was made at Funspot in New Hampshire, USA, the world’s largest arcade centre.
Featured in Guinness World Records Gamers Edition 2011
GWR Video Gamer's Edition 2008
For a complete list of 2007 records, please visit 2007 Guinness Records in United States.