V-Tetris was created in 1995.
Tetris Plus was created in 1990.
V-Tetris was created in 1995.
Tetris Attack was created in 1996-08.
Tetris - iOS - was created on 2008-07-09.
Tetris Party was created on 2008-10-14.
Tetris Worlds was created on 2001-09-05.
Tetris Splash was created on 2007-10-03.
Tetris DS was created on 2006-03-20.
The New Tetris was created on 1999-07-31.
Magical Tetris Challenge was created on 1998-11-20.
There is no "Cheats" in any Tetris games made by the Tetris company.
Mr Pajitnov developed Tetris in 1985 at the Moscow Academy of Sciences' Computer Center. There is an interesting story about him and the game in the link below. http://www.prnewswire.co.uk/cgi/news/release?id=34683