Unfinished tasks are presented to you at the same time you are completing tasks, which means your reactions are faster than your spatial reasoning. Instead thinking about Tetris while you're playing it, you think with it. This is called Epistemic Action.
How Tetris Affects Your Brain
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Key Facts In This Video
Playing Tetris may reduce flashbacks for people with post-traumatic stress disorder (PTSD). 01:05
Tetris is addictive because it appeals to our natural desire to organize things, complete tasks and achieve goals. 01:43
The pace of Tetris forces players to think with the game instead of about it, which is called Epistemic Action. 02:22