Free Color Tetris Game
Full user review
"Decent basic game"
Generally works, and is mesmerizing. Get two or more blocks of the same color across and they disappear. Let the screen fill up with blocks and game over. Use left and right arrow keys to move the blocks as they fall. Starts off slowly so you can get a feel for the game, then gets much much harder as you go along.
Don't know if it's buggy or if it's cheating, but it seems to hang some of the blocks up too high on the right side of the window. I wish it kept score. Seems like somebody's school project that they made available for free. If so, not bad.