You cannot clear over four lines in most games, but in games with recursive gravity like Quadra and Lockjaw: The Overdose that reward a player for clearing as many lines as possible, an average player may clear nine lines or more.
Drop Z or T
In Quadra, a player can clear over half the screen this way:
Drop Z
General Tips[]
Avoid creating empty columns that are over ten rows high. There will be no room above the platform to place any more than one or two I tetrominoes.
Many cascade games use the traditional randomizer. Create the platform early to minimize the threat of an I drought.
Creating the platform[]
In Quadra, a player is encouraged to create the platform over the far left/right column as early as possible. Since duplicate I tetrominoes need to be placed above the platform, it's better to place them while stacking than to place them after you have stacked high enough. The best way to create a platform would be to build up the second to last column from the left/right wall. In Quadra, a player would often use the starting tetromino as a base, place an I on that tetromino, and then place a tetromino above the I to create the platform.
Bases[]
J Base
Z Base
LZ Base
Platform[]
Dedicated Platforms
Dedicated platforms are solely used to create the overhang above the empty column.
Cascading Platforms
Cascading platforms contribute to clearing the empty column.
Safety Platforms
If a player were to build a column too high, there are still a few countermeasures.
Tetris Worlds allowed for up to nine cascades before clearing the last levels, so players would fit an extra one in.
Unorthodox Line Clears[]
In games with recursive gravity that reward cascading line clears such as Tetris Worlds and Quadra, certain line clears discouraged in naive gravity allow the player to score a perfect clear.
