Bejeweled may be a silly game, but after my stroke, it helped me greatly in getting my concentration back. Anesthetic doesn't have as much of an effect, but yeah, you can spend a few days feeling like there's a cloud behind your eyes.
I have a friend in early 70s with Alzheimiers in her family and she does games and puzzles etc specifcally created for the purpose keeping the brain muscles active to slow down deterioration.
I do other stuff as I can’t handle games. One is memorizing verses.