In games with recursive gravity that reward cascading line clears such as Tetris Worlds and Quadra, certain line clears discouraged in naive gravity (like in most games) allow you to score a perfect clear.
Reflection
A three-cascade example:
Special
O Replacement
Due to the 2x2 nature of the O tetromino, the mirrored line clear formation is the same for both the S and Z tetrominoes.
J/L Replacement
The T tetromino can be used in the following situations where only the L or J could be used initially.
Hurdle
Translation
See also
