Thanks for you comment. I am working on it now.
1- Perfect solution, you get a green notification when you find the one, in which other squares with no number have zero threats. Pressing the 'solution' button reveal the perfect solution
2- Imperfect solution, you get a yellow notification when you find one, in which other squares with no number may be under one or more threats.
A bit confusing so for now I try not to be strict about imperfect solutions.
2- Imperfect solution, you get a yellow notification when you find one, in which other squares with no number may be under one or more threats.
A bit confusing so for now I try not to be strict about imperfect solutions.