[Serious] "Doing Brain-ups", how do you exercise your brain?

[Gawdzilla Sama]

I don't have a firm grip on what exercise I can do to improve my cognitive abilities. Closest I do, that improves my mind, is mindfulness meditation. At least I think that maintains my mind.

I was told "first, it should be fun" so I'd keep doing it. Then something that will challenge you. POGO has Scrabble at escalating levels of skill, so I'll be challenged for a good long while.

And, of course, it doesn't have to be games. I used to do intarsia because it demanded concentration and planning. I have a few dozen half-completed projects to deal with if I ever get back into the basement.