https://www.youtube.com/watch?v=KTu-Nu1gjjg
“热点” 作者:Ryan W.
https://sudokupad.app/c2htj0grjc
规则:(1) 标准数独规则;(2) 每个 9 的横竖相邻数字的和是 9(举个例子,若 R1C2 是 9, 则 R1C1 加 R1C3 加 R2C2 是 9)
Here's where you can try Hotspots by Ryan W.: https://sudokupad.app/c2htj0grjc Normal sudoku rules apply. Each 9's orthogonal neighbors sum to 9 (e.g. if R1C2 was a 9, R1C1 plus R1C3 plus R2C2 would equal 9).