■ Ideal for brain training It is a brain training game that trains your brain happily in a short time. There is no time limit, so you can do your brain teaser at the pace that suits you. Twice ■ The rules are simple It is a brain training game that combines numbers to make 10. If you can't solve it, you can get hints so you can play at your own pace. ■ Deep system At first, you can easily erase the numbers, but if you somehow erase them without using your head, the number of steps will become s