指大 Point Next

标准数独基础上，如果箭头格内是N，箭头指向的方向里必定有N+1。

Classic rules applied, additionally, the arrow cell with number N must points to a direction with N+1.

◆N阶数独中，箭头格不能有N。

N cannot be on the arrows in NxN puzzle. 

◆如果一个箭头所指的所有格都不能是A，那么这个箭头格必定不能是A-1。

If all the cells an arrow points cannot be A, the arrow cannot be A-1.

◆箭头上的数字A和它指的A+1必定有着相反的奇偶性，并且它们一定是连续的。

A in arrow cell and A+1 must have opposite parity, and they must be consecutive.

◆连续对 Consecutive pairs 

有时不止一个连续对，这时问题就转化为有方向的长连续。可以参考连续数独的内容。

Sometimes more than one pairs are consecutive, then the problem changes to Long Consecutive with directions. About Long Consecutive, you can read about Consecutive.

◆一一映射 Mapping in pairs

在这个案例中，黄色区域的数字与粉色区域的数字一一映射，因此C3必须是奇数。

In this example, numbers in yellow are mapped with numbers in pink. So C3 must be odd.