What are some alternatives?
Threes - Threes is an Amazing Challenging Puzzle video game developed and published by Sirvo LLC.
Elevate - Elevate is an award-winning brain training tool designed to build communication and analytical skills.
Play2048.co - Puzzle game written by 19 - year old Italian designer Gabriele Chirulli based on 1024.
Peak - Peak is the automated way to keep track of what everyone is working on.
XOLT - Smart and addictive number game puzzle in a beautiful Stonehenge theme!
Brain Workshop - Brain Workshop is a open-source version of the dual n-back brain training exercise.