About original game: Tetris on Wikipedia
Sergey A Kryukov, derived work
http://www.SAKryukov.org
http://www.codeproject.com/Members/SAKryukov
Based on algorithms and working prototype developed by Jake Gordon:
http://codeincomplete.com
http://codeincomplete.com/posts/2011/10/10/javascript_tetris
https://github.com/jakesgordon/javascript-tetris
License: LICENSE.txt, based on MIT license
Original publication: http://www.codeproject.com/Articles/876475/Tetris-On-Canvas