YSK if you've seen something traumatic, playing Tetris for a couple of hours afterwards can drastically reduce the chance of it becoming a deeprooted memory and causing PTSD
A single dose psychological intervention, which includes using the computer game Tetris, can prevent the unpleasant, intrusive memories that develop in some people after suffering a traumatic event.
After reading this I thought there must be a nice and simple Tetris game in the play store. Boy was I wrong. I think some guy has a "block puzzle" empire and has just rereleased the same tetris clone game a hundred times. And official Tetris is a total abomination of unlocks and achievements.
There are three main Tetris games as far as playability goes.
Classic Tetris for NES where you play with your foot
Tetris effect where handling and graphics are decent Tetr.io where speed is everything
Notable mentions
Tetris 99 - tetris for Nintendo switch
PuyoPuyo tetris - sometimes you play puyopuyo sometimes you play tetris
I went through a similar thing, conclusion I came to was that as Tetris is so popular, the owners of the IP have it on lockdown... it is quite a specific IP that's kinda hard to do something similar-but-the-same.
Options I came up with were pirating a copy, or xbox game pass (iirc Tetris Effect is available there). Or... are there any Gameboy emulators that run on mobile?
I'm glad I decided to re-read the comments on this, as someone with aphantasia who really struggles with spatial stuff... WHAT THE FUCK, you weren't exaggerating haha
For Android there is Techmino, though it isn't on the Play Store and instead you download it from the project's github. https://github.com/26F-Studio/Techmino