How to Tetris

15: T-Spin Triple Tower

Tutorial Videos

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Basics

The back-to-back T-spin triple tower (TST Tower) is a spliced setup that grants 2 T-spin triples.

Diagram Set 15-1
12
The crossed and non-crossed purple blocks represent 2 distinct T-spin triples.

It is mighty, with simple ways to create it mid-game. However, it can be risky because of the high upstack required.

A Warning: Dirty TST Towers

Dirty TST Towers should be abandoned or cleaned properly:

Diagram Set 15-2
12
If there is 1 extra hole in this row, the TST tower will be dirty.After the line clears, you may then need L or J spins to clean up the cavity.

Mid-Game Chances

TST Towers are incredibly simple to make and offer some of the most straightforward mid-game chances.

1. Easiest Opportunity: SL or ZJ Prop

    This is the easiest mid-game chance to create a TST Tower:

    Diagram Set 15-3
    12
    Spot this lavender mid-game pattern.  Just stack S and L this way (Z and J if mirrored). Make an overhang. Done!

    2. Freestyling TST Towers

    There are many ways to freestyle TST Towers to boost your chances of creating one mid-game.

    To create this setup, first spot this:

    Diagram Set 15-4
    Observe the blue-circled 2-block pattern. This mid-game opportunity happens most often mid-game.

    Then, freestyle its sub-structure:

    Diagram Set 15-5
    AB
    CD
    EF
    Place the above pieces over the opportunity in the previous diagram set. You have many ways to create this setup.

    3. Categorized Freestyling Methods

    To simplify the last sub-section’s permutations to create the tower, I have categorized them by common freestyle mid-game situations.

    This is the most common:

    Diagram Set 15-6
    12
    Beyond the S/L or Z/J prop, you can freestyle by creating a flat base with the lavender part (red circle), then stack a flat Z (S if mirrored) on top to form the TST tower.

    This is another common set:

    Diagram Set 15-7
    AB
    Here are other ways to freestyle the TST tower. The top 2 diagrams are among the most common configurations.

    This sometimes happens:

    Diagram Set 15-8
    12
    The top of the TST tower can sometimes be freestyled and topped off with a horizontal I piece.

    These 2 are highly common situations:

    Diagram Set 15-9
    AB
    Here are other non-exhaustive ways to freestyle the top part.

    Using it Opportunistically and Safely

    Back-to-back T-spin triple towers should be used opportunistically for safety.

    Diagram Set 15-10
    12
    The lavender areas should be stacked almost entirely before making a back-to-back T-spin triple tower. When it is, you only have to put a few pieces (S and L, and the overhang) here to make the setup easily.

    Suppose you see the above step 1’s opportunity, but the lavender areas are not pre-stacked. In that case, you must spend an excessive amount of time upstacking them before setting them up.

    This makes you vulnerable to being spiked. Therefore, this method should only be used opportunistically unless you are faster than your opponent.

    Continuations and Follow-Ups

    TST Towers can be easily followed up by the following:

    1. STSD to TST Tower Follow-Up

      Diagram Set 15-11
      12
      An STSD with a vertical S/Z overhang allows for a TST tower to be made as a follow-up. Observe the shape after this T-spin double line clear.
      34
      After the T-spin double line clear, you get an exact opportunity to make the TST tower. The first T-spin double also protects you from spikes.

      The above method is highly practical mid-game.

      Variations

      TST Towers have several variations.

      1. The Infinite TST Tower Loop

        There is a method to chain T-spin triples non-stop using fixed pieces. This is typically used in Ultras to secure the highest score, as it has the highest T-spin efficiency among all stacking forms. It surpasses the mighty LST, ST, and LT stacking methods! Here is the basic form:

        Diagram Set 15-12
        12
        Spot this mid-game pattern.Stack L, I, and Z to create the overhangs on the left side. Also, place the S and L on the right side when making the base.

        The infinite TST Tower looping method involves repeating the above shape. Here is how:

        Diagram Set 15-13
        12
        34
        56
        78
        Please study this sequence. Notice how the same pieces repeat the same pattern?

        By memorizing the sequence, you can repeat it infinitely and perform the TST Tower loop.

        However, doing this mid-game is not safe or practical. It is suitable mainly for Ultras.

        2. Multiply Stacked TST Towers

        In rare situations, you can stack TST Towers beyond their initial 2 T-spin triples:

        Diagram Set 15-14
        A
        Occasionally, you can freestyle and insert more T-spin triples into the TST tower.

        However, this is risky.

        In a Nutshell

        TST Towers have among the highest T-spin efficiency and firepower in Tetris. However, it is best used opportunistically because of its heavy and dangerous upstacking.

        Pros and Cons
        ProsPowerful burst.

        Easy to create if both sides of the stack are already upstacked, and you only have to put a few pieces (like Z and J) to make the double T-spin triple cavities.
        ConsThis method is risky as it has high T requirements — without extra Ts, you are in trouble.

        Unclean: leaves a T-spin triple overhang.