EndeavorOTC is an "over the counter" adult version of Akili’s FDA-approved, prescription-only game for children with ADHD.
It recommends 6 weeks of gaming for 25 minutes a day. I started using it this morning. The game mechanics are simple. It was engaging just barely enough to let my mind get ever so slightly bored and then I had to work to focus again. I wanted the 25 minutes to end, but I felt good about what it was making me do.
https://venturebeat.com/games/akili-releases-endeavorotc-for-adults-with-adhd-symptoms/