LST Stacking

credit to kazu for many of the examples used in this page

A very practical stacking method that can be used both in versus and Ultra. Called LST (LST) stacking because you repeat L and S on the left side while using the T to do a T-Spin Double.

LST Stacking (left) is different from ST Stacking (right) where you only use S on the left two columns. Note how LST Stacking is a bit denser—this leads to a higher efficiency ceiling.


The basic idea is to repeat the following pattern with LSJZ

Basic Steps

Step 1: Create an overhang with L or J and then do a TSD.

Step 2: Build the rest of yellow.

Step 3: Create an overhang with S or Z and then do a TSD.

Step 4: Build the rest of orange. Repeat from Step 1.


When your T comes late on Step 1, you can skip the TSD and build a Fractal.

This works because, in a sense, LST Stacking is Fractals stacked on top of Fractals.

Opening from Flat Top TKI

The flat top TKI opener is undoubtedly the most popular way to start the first two TSDs before transitioning to LST Stacking.

First and Second TSD

Third TSD

LST starts from the third TSD and onward. After this second TSD,

your third TSD can look like below. Note the two possible placements of S.

Can you spot the hidden Js?

Alternate pieces

The easiest way to do LST Stacking would be to repeat LSJZ like above. However, this is often not possible, and therefore, in those cases, the right part is built in alternative ways. Here are some examples.


These alternate pieces do not mix between the overhang part (orange) and the yellow part.


These patterns are a bit more advanced as it mixes the overhang part (orange) and the yellow part.

Common Mistakes

These are two common mistakes which would terminate LST because it is impossible to place a block on the spots marked purple to continue LST:


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