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Sudoku is one that's been studied and shown, so far, to help with some cognitive issues.
Role of prefrontal cortex during Sudoku task: fNIRS study
In the same vein, I’ve been doing crosswords on my phone on the shitter instead of browsing. First few times felt like I was remembering words that I haven’t been using often, but after a while I stopped feeling like it was helping me with anything.
I’m going to tentatively say that racking your brain for specific words (or otherwise learning new ones) might be marginally better for you than the average pure time wasting game.