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.
https://openpathcollective.org/ provides a long list of therapists that work on an affordable, sliding scale. If you experience something traumatic, please seek support for your mental health