This is actually an incredibly complicated subject. The ELI5 answer is that video games have been designed specifically to give you constant mental stimulation and enjoyment.
The slightly longer answer is that humans have spent hundreds of years working on game design and understanding what aspects make the mind want to keep playing a game. For the longest time, this pursuit of knowledge was for gambling. In the last 4 years, it has turned to video games as well.
Just above every moment of the game you are playing has been designed and tested to make you want to keep playing it. Studying. not so much.
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