Old Key is an opener when S (Z if mirrored) comes early. First created by Yuu. It starts with a T-Spin Single in the first bag and a T-Spin Double in the second bag.

First Bag

Second Bag

In the second bag, you will always make a TSD with one of these three methods.

Third Bag

Depending on the method, there will be different TSD followups.

Form 1

For this followup, L can be placed even though S and J may be already placed.

Form 2

Form 3

You can always make a TSD with these two methods.

Perfect Clear

Theoretically, Perfect Clear after 10, 12 or 14 lines is possible. All patterns here are invented by MalaiABUeditor. All percentages are approximate.

From Form 1

• 100% - TSS to TETRIS: for this one, you have to place 8 pieces instead of 7 to achieve the Perfect Clear. There is also a 12-line solution. Some may result in a TSD before the PC and some may result in a Tetris PC.

From Form 2

• 20% - TETRIS

From Form 3.1

• 25% - 10-line PC

• 40% - Donation TSD

From Form 3.2

• 75% - TSD

• 50%