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It's still unclear to me even with hint turned on. I don't understand why a line is considered correct even though the hint says so.

Speaking of hint button, I clicked hint button after it ... gives hint to turn it off and click it again to turn it on, and the hints are gone. I didn't change anything on the board at all.

You really should add tutorial levels at first showing game's rules from basic.

Hi I fixed the hint on off thing. Now it shows immediately the right rows and columns. I consider to make a tutorial.