Best Tetris

Which free online version of tetris is the best one? I have a hard time finding a good one, they all seem to be glitchybuggy weird responce timey non highscore mockups

1. Buy an old gameboy on ebay
2. Buy the original tetris for the gameboy
3. Get a couple of batteries
4. Enjoy the best purchase you have ever made

Tetris DS hands down!

But I need a version to play while at school/work and a gameboy/ds wont cut it.
I need to look busy working ,when im playing

"Tetris DS hands down!"

"Tetris DS hands down!
"

I can't see what someone can get wrong with Tetris. Are the controls buggy or something?