a recent interview with Gamasutra, he revealed that he's been tinkering with multiplayer versions of Tetris for "more than 10 years."
Pajitnov explained that, due to the game's frantic speed, players "have no brain resources to observe what the other people are doing." His ideal multiplayer solution would be one in which players "could really see what the other people do and take their gameplay and their achievement and their status in the game really [into] account."
We'll solve your decade-long predicament right now, Mr. Pajitnov: Bullet time. Yeah, you just sit and think about that one for a while.