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

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?