Wild Matsu | Tetris the Absolute: The Grand Master 2 Plus Doubles 1CC @WildMatsu | Uploaded April 2023 | Updated October 2024, 1 day ago.
Marty (Player 1) and myself (Player 2) have been working on this one for a while. If you haven't tried this mode, it's really hard. Here's a few reasons why:

(1) It's not guideline Tetris. Pieces lock not when you press up to do a hard drop, but when you press down to do a soft drop. Being able to hard drop a piece without having it lock is nice sometimes, but if you're used to guideline Tetris, it can be challenging to adjust to.
(2) There's no piece hold, so you just have to play whatever piece you get no matter how bad it is.
(3) There's no seven-bag randomizer, either, and the RNG can be really mean about what pieces it gives you sometimes.
(4) It's really challenging to keep track of what your partner is doing, and it's really easy to step on each other's toes and mess things up if you don't, and there isn't anywhere near enough time to verbally coordinate where to put pieces.
(5) The game interacts really strangely with rollback; we've had rollback undo a movement or rotation resulting in a bad misdrop countless times during our attempts to get this clear. The rollback, also, of course, adds in a delay to seeing and comprehending what your partner is planning to do. This recording was done from input files after the fact. So for you, the viewer, no rollback is visible, but we had to deal with it. If it looks like we sometimes react really slowly to each other, that might be why. (Genuine mistakes do also occur.)
(6) It's not a clear unless both players reach level 300. You gain one level for every piece you place and every line you clear. Furthermore, to get from level 299 to 300, you MUST clear a line, or you get stuck there. Also, when one player reaches level 300, pieces begin to fall instantly, severely limiting where you are able to actually place pieces, and if you haven't learned how to play that way, it's difficult to play that way for long.Thus, it's important for both players to remain roughly synchronized. You have to be careful to try to give the player who's behind in level more lines. At the end, I reach level 299 before Marty, and so I deliberately avoid taking any lines until he catches up.

This clear was played on Fightcade. The replay is available here: replay.fightcade.com/fbneo/tgm2p/1682205633491-3920