價格：免費
更新日期：2014-08-22
檔案大小：2.3 MB
目前版本：1.1
版本需求：需要 iOS 7.1 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Binary 21 is a fun way to practice your binary number counting skills. Touch and drag to connect the numbers to match the target number.
If you get stuck you can shuffle the entire board, or flip a bit from 0 to 1 (or 1 to 0). But you only get one shuffle and one swap every time you get to a multiple of 21.
Here's a hint to get your started if you're not familiar with binary.
Decimal = Binary
0 = 0
1 = 1
2 = 10
3 = 11
4 = 100
5= 101
6 = 110
7 = 111
8 =1000
支援平台：iPhone