atari2600land has updated his single and two player simultaneous play variant of a very well known russian block game. The game was previously known as “Tetris”.

Release notes:

I sped the game up a little. Level 9 is the fastest it can go without it being impossible to move the pieces in time. I’ve also added a nifty (IMO) feature: If you toggle the color switch to black and white at the title screen, you can play a game in black and white! I thought, since you can do it in GoSub, why not this game, too?

http://www.atariage.com/forums/topic/153710-2600tris/page__st__50