Hidden numbers - a very good memory and concentration training game for all ages, stimulating brain movement. There are 2 genres you can try: + Memorize & flip value cells from small to large (0-99) You will have time to memorize the value of each cell and remember the exact position of the cells to sort the value from small to large. When the ready button is pressed or the memo time expires, the time is automatically switched to game mode. Difficulty rating: - Memorize for limited time - Number