Bests & Worsts Reviews from Amazon

according to people

180
people found this helpful, as of 2023
ranked #191,156 most helpful out of 571,544,897 reviews
★★★★★
Excellent brain game
I have been using this app for about two weeks and I already notice a big improvement in my ability to focus!!
April 2016 · Unknown · verified purchase
the product in question
See the Product
worser bester