Honestly the best brain training game is learning something new

If you expect linearly increasing benefit from repeating the same thing (e.g doing a sudoku every day), you’re unfortunately barking up the wrong tree

You need to be constantly challenging yourself with new knowledge and ideas to keep neuroplasticity high

You assume that an actual committee exists and its not 100% marketing lies.

There was a Nintendo DS game back in the day called Brain Age that claimed to be based on studies of neuroplasticity and all sorts of stuff, and they claimed that playing their brain-training mini games regularly would reduce your brain’s “cognitive age.”

I don’t think it was all complete bullshit, but later studies showed that the claims were overblown and all that was really happening is that you were training yourself to play the games better, just like would happen with any other game, so the cognitive age aspect was basically marketing bunk.

Psychology, medicine and in a broader sense philosophy define what stimulates the brain and to what result. Ask there.