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

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Tetris used to prevent post-traumatic stress symptoms | University of Oxford

https://www.ox.ac.uk/news/2017-03-28-tetris-used-prevent-post-traumatic-stress-symptoms

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.

Tetris used to prevent post-traumatic stress symptoms | University of Oxford