Train your instantaneous memory. 　 ■ Application Features With over 500 problems, there’s no end to the fun. This game is easy to jump into, but hard to put down. You can also play offline. Even playing for a short amount of time can be a lot of fun! Compete for the best score in the world rankings. Enjoyable for all ages. Play with a difficulty that matches your level. Increase your ability to concentrate through brain activation.