價格：免費
檔案大小：1.9 MB
版本需求：需要 iOS 8.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Can you get to the target number within 9 turns? Nonagon will test your ability to add, negate, multiply and divide in quick succession and in doing so, train your brain. Work your way up through the different levels by matching the current number to the target number as quickly as possible. The fewer turns it takes, the more points you'll gain. Good luck :)
支援平台：iPhone, iPad