 Main article: Perfect Clear
Perfect Clear Guide originally written by Isara Rungvitayakul. Updated.
What is a Perfect Clear?
A Perfect Clear (PC) means having no filled cells left after a line clear.
How to make a Perfect Clear?
This guide tries to give a higher chance of performing a Perfect Clear. The best scenario is to attempt it at the beginning of a game, when your opponent has not finished building up their stack. If you succeed, this usually becomes a K.O.
Note that this guide does not guarantee a 100% chance of success in making a Perfect Clear. It also requires a lot of understanding and practice to make it work in a game. However, failure is not as bad because you can continue making a stack for TSpin or Tetrises.
The process contain 2 steps.
 Create a stack that makes a perfect clear more possible
 Look for tetromino combinations that will make it succeed.
Stack for a Perfect Clear
This is a stack that makes a Perfect Clear much more likely, since it is built with every tetromino from the first bag and has 12 holes, to fit 3 tetrominoes from the second bag.
In the first bag, I, L, O and JBlock form a square. You can also split the square into an LOJ rectangle and an IBlock separate from the rectangle, which works the same.
S, T and ZBlock form the following shape. Note that you should get T before Z to make this shape.
It is possible to build the stack in other ways.



Mirrored setup:
Using the Next 3 Tetrominoes
Assume you have built your stack like this:
The next thing to worry about is what the next 3 tetrominoes will be. Note that you can use the hold piece to hold a tetromino. As a Tetris player, you should know that the sequence is very important in many cases.
Examples
LTI
A solution is shown here. This solution will work regardless of the order of the tetrominoes. This solution requires an LSpin. IBlock can be dropped at any time.
Rotate an LBlock counterclockwise and soft drop into the desired position:
Then rotate clockwise once:
Then drop an IBlock (or TBlock if it comes next):
Resulted in a line clear making a Perfect Clear spot for the TBlock:
SLZ
For this solution, S should come first. The order of Z and L does not matter. If L comes before Z, it requires a ZSpin.
Rotate an SBlock and soft drop, then rotate again, as shown:
Then drop LBlock into the desired position:
The hardest part is to do a ZSpin. Rotate counterclockwise and soft drop to this position:
Spin counterclockwise again to kick into this position. Sometimes, it may not go in. If it does not go in, spin around until it kicked in. This requires some practice.
All solutions

