Garbage thanks to a certain "feature"...
"There is one aspect of the gameplay that unfortunately cannot be turned off. Once the piece in play reaches the bottom, you can continue to spin it infinitely, which will keep it from setting and keep the next piece from dropping. While your Tetris piece is in this limbo state, you can also move it side to side, giving you ample time to decide where it should go. This change effectively castrates the game, removing any challenge it might have presented. We were able to tear through the game's 15 levels of difficulty without breaking a sweat, thanks to this infinite spinning feature. The point of Tetris has always been to push the player to think and move as quickly as possible. With Tetris Worlds, there is no point."
(Full review here: http://www.gamespot.com/ps2/puzzle/tetrisworlds/review.html )
I couldn't agree more. While multiplayer is nice, for me, the most fun to be had in Tetris is the single-player mode. With single-player mode effectively ruined, the whole game is ruined. If someone had mentioned that this problem exists in Tetris Splash, I would not have purchased this non-refundable game.