RULES AND FEATURES
For what reasons this version of Tetris is called a Professional, it is difficult to say, but it is made soundly and efficiently. There is no background grid in the glass, which will certainly require additional attention from the player, but this inconvenience is compensated by the shadow of the figure at the bottom of the glass.
Flash player plugin is not supported still Feb.21.
Alternative game you can play right now:
You can play the game TETRIS PROFESSIONAL online 24 hours a day for free. It is no need to download and install it on your computer, and it is also not required you to be the registered user. Just ckick and enjoy. See also a set of related games below on that you might be interested to look.