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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.

Tetris Words™ Not Tetris Words™
STOP NONSTOP
FLAME FIRE
HIJACK TERRORISM
BACKWARD FORWARD
POETRY ARTICLE
CHILD PARENT
YOUTUBE TWITCH
WRESTLE SUMO
CARCASSONNE PROVENCE
JACKPOT MONSTER
WAVERS STALLS
FLAG FLAGSHIP

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

Tetris Words™,Not Tetris Words™
STOP,NONSTOP
FLAME,FIRE
HIJACK,TERRORISM
BACKWARD,FORWARD
POETRY,ARTICLE
CHILD,PARENT
YOUTUBE,TWITCH
WRESTLE,SUMO
CARCASSONNE,PROVENCE
JACKPOT,MONSTER
WAVERS,STALLS
FLAG,FLAGSHIP

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

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  • $\begingroup$ ooh, another one :00 $\endgroup$
    – oAlt
    Commented Aug 1, 2019 at 5:41
  • 1
    $\begingroup$ I love this series :P $\endgroup$
    – Conifers
    Commented Aug 1, 2019 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
    Commented Aug 1, 2019 at 10:10
  • $\begingroup$ Examined JACKPOT is Tetris word :) (Maybe I'll produce more example later.) $\endgroup$
    – Conifers
    Commented Aug 1, 2019 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
    Commented Aug 1, 2019 at 10:49

2 Answers 2

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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
    Commented Aug 5, 2019 at 3:42
  • $\begingroup$ Hypertapping is not how I roll. $\endgroup$
    – Bass
    Commented Mar 29 at 18:50
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PARTIAL ANSWER

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
    Commented Aug 1, 2019 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
    Commented Aug 1, 2019 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
    Commented Aug 1, 2019 at 7:09

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