Tetris Twist

Tetris Twist is an officially licensed web-based single-player Tetris game. It's available in Japanese and English, and it can be played with keyboard or mouse. The game consists of 100 missions whereas the goal in each mission is to surpass a certain score. After beating those missions one can also play a 150 lines Marathon game.

Gameplay Details
A mission takes about 20 lines to complete and up to 3 stars are rewarded for surpassing certain scores. Combos are not rewarded; T-Spins score the highest per cleared line. Gravity stays pretty low but players are challenged by the following gameplay mechanics:


 * Garbage Lines: Garbage rises from the bottom after a certain amount of pieces dropped. Those lines will most-likely contain more than one hole; garbage blocks are colored black.
 * Plus Sign Cells: The player has to clear a line involving that cell. Usually, it means the player has to clear a line in a certain height. However, the line is not counted, if the cell is filled with a black block.
 * Field Flip: The content of the field is rotated by 180 degrees. Afterwards, the pieces fall to the ground and a cascade reaction happens.
 * Vertical Mirroring: An upside-down cascade reaction happens (all pieces rise to the top). Afterwards, the player has to play upside down until this effect is recurs a second time.