What are some alternatives?
Threes - Threes is an Amazing Challenging Puzzle video game developed and published by Sirvo LLC.
Lumosity - Discover what your mind can do. Improve memory, increase focus, and find calm - with the #1 brain training app. Get started now.
2048 - Puzzle game written by 19 - year old Italian designer Gabriele Chirulli based on 1024.
Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.
XOLT - Smart and addictive number game puzzle in a beautiful Stonehenge theme!
Peak - Peak is the automated way to keep track of what everyone is working on.