This is a ‘Moon or Sun’ puzzle - I'll be sharing the rules along with some tips, tricks, and strategies on how to solve them.
Try it yourself here: http://pzv.jp/p.html?moonsun/10/10/k1...
100 Sudoku Variants Puzzle Book: https://www.amazon.com/dp/B08P3PCC85
100 Logic Puzzles Book – Volume 1: https://www.amazon.com/dp/B08T71QVQ8
100 Logic Puzzles Book – Volume 2: https://www.amazon.com/dp/B08YQCP6L6
Other puzzle tutorials: • Puzzles - Rules & Strategies