Magical Tetris Challenge

Magical Tetris Challenge is a Tetris game released in Japan for arcades, and elseware for a variety of consoles. It does not contain any true single-player game modes, restricted entirely to two players, either against the computer or another player.

This game uses its own rotation system, which seems to be a bastard mix of Atari rotation and SRS, with different initial piece orientations. All pieces other than T and square start vertical (!). Ls and Js start upside down.

It uses a total lock time system, where you are given a certain number of frames of lock delay for each tetromino.

All pieces rotate as in SRS, EXCEPT for the I, which is left handed Sega rotation system.

There are some wallkicks as well, but they don't seem to match SRS.

Apparently the ghost piece system was licensed from Arika.

Magical Tetris
Magical Tetris has a similar formula to Versus modes from other Tetris games, with players drawing from the same "Next" preview à la Tetris Battle Gaiden (though here, it's placed into the player's own "Next" window, as opposed to being the next immediate piece the player uses). However, instead of giving garbage lines to the opponent upon clearing lines, the players send pentominoes that temporarily replace the tetrominoes drawn from the "Next" window on the opponent's side. Up to 14 pentominoes can be sent to the opponent.

The pentominoes that can be sent include the following: I, T, U, and W pieces are the most common, while the remaining four are slightly more rare.

Any further pieces sent will overlap the pieces at the end of the queue and become one of three "giant" shapes, marked in the queue with a red "!".

By clearing lines with Magic Pieces in the queue, players can "counter" the pentominoes and send them back to the attacker before they are put into the player's own "Next" window, turning them into metallic square pieces in the process (identified as white "?"'s) that start at a size of 2x2, but if the attacker is able to re-counter the countered pieces, it will increase in size becoming a 3x3 piece, and can be re-countered again to further increase its size, up to 5x5.