This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.

If a word conforms to a special rule, I call it a Tetris Word™.
Use the following examples below to find the rule.

$$ % set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{1.0}} \def\Title{\textbf{ Tetris }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ STOP }&\text{ NONSTOP }\\ \hline \text{ FLAME }&\text{ FIRE }\\ \hline \text{ HIJACK }&\text{ TERRORISM }\\ \hline \text{ BACKWARD }&\text{ FORWARD }\\ \hline \text{ POETRY }&\text{ ARTICLE }\\ \hline \text{ CHILD }&\text{ PARENT }\\ \hline \text{ YOUTUBE }&\text{ TWITCH }\\ \hline \text{ WRESTLE }&\text{ SUMO }\\ \hline \text{ CARCASSONNE }&\text{ PROVENCE }\\ \hline \text{ JACKPOT }&\text{ MONSTER }\\ \hline \text{ WAVERS }&\text{ STALLS }\\ \hline \text{ FLAG }&\text{ FLAGSHIP }\\ \hline \end{array}$$

And, if you want to analyze, here is a CSV version:

Tetris Words™,Not Tetris Words™

Hint 1

In 2018 Classic Tetris World Championship(CTWC), Joseph Saelee has defeated Jonas Neubauer who is the 7 championship winners in previous 8 CTWC tournaments

Hint 2

Joseph Saelee used Hyper-___ technique to beat the opponent in the first time

  • $\begingroup$ ooh, another one :00 $\endgroup$ – oAlt Aug 1 '19 at 5:41
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    $\begingroup$ I love this series :P $\endgroup$ – Conifers Aug 1 '19 at 5:42
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    $\begingroup$ Is JACKPOT definitely a Tetris word? I think I've identified a pattern which matches every word (Tetris and Non-Tetris) except for JACKPOT. $\endgroup$ – hexomino Aug 1 '19 at 10:10
  • $\begingroup$ Examined JACKPOT is Tetris word :) (Maybe I'll produce more example later.) $\endgroup$ – Conifers Aug 1 '19 at 10:13
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    $\begingroup$ Just to let you know, even with the new words, JACKPOT is still the only word I can't get to match. $\endgroup$ – hexomino Aug 1 '19 at 10:49

A Tetris Word is such that

If we highlight its corresponding letters on a Tap Code Table (as shown below), there will be four squares which form an isolated tetris piece (not part of a bigger polyomino as happens with NONSTOP).
enter image description here

Why didn't I get this sooner

I had figured out the essential idea previously but was instead using a Polybius Square.
As it turns out, all the same words work (both Tetris and Non-Tetris) except for JACKPOT.

It was hint #2 which put me in the right direction: "Joseph Saelee used Hyper-tapping technique to beat the opponent in the first time"

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  • $\begingroup$ You just nailed it :P $\endgroup$ – Conifers Aug 5 '19 at 3:42


A Tetris Word™ always contains

at least one pair of letters that are alphabetically-consecutive. For example, POETRY has O+P, YOUTUBE has T+U, and FLAME has both E+F and L+M.

But some of the Not Tetris Words™ also have the same property, so this isn't a sufficient condition.

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  • $\begingroup$ Need something related to Tetris~ Keep going :P $\endgroup$ – Conifers Aug 1 '19 at 6:28
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    $\begingroup$ Could it have something to do with the letter-names of the tetris pieces (O, I, Z, etc)? My strategy would have worked if it weren't for "BACKWARD" :< $\endgroup$ – oAlt Aug 1 '19 at 6:51
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    $\begingroup$ @oAlt Nice try~ related to tetris pieces is correct :P Hint will be posted later hours~ Keep going! $\endgroup$ – Conifers Aug 1 '19 at 7:09

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