Other things seemed to have a bigger impact. I don't think playing the same game improves overall thinking. Maybe just the speed and accuracy in just those game dynamics. Prolonged exposure to the same game, eventual returns no gains and just wastes time.
Changing the dynamics and "playing a different game each day" with no repetition might just push the right cognitive buttons to improve on other mental abilities. App stores FREE GAME sections are growing exponentially with tons of variety. Why not give this new approach a try. I'd love to hear about your personal experience with this approach.