I'm in the middle of planning a startup with a doctor who does research on therapy methods for traumatic brain injury. She frequently goes on rants about how much bullshit Lumosity is. So literal appeal to authority, but this particular authority was doing research at NIH for 17 years. I think she knows what she's doing.
Are there any that aren't bullshit? I'm debating just setting up a spaced repetition app with my own custom knowledge base. At least that way I may not be getting higher brain function, but higher retention on memory items I care about.
1.Learn a Second Language 2. https://projecteuler.net/archives 3. http://rosalind.info/problems/list-view/
If you are going to exercise your brain, you might as well get smarter and learn useful skills in the process.