The rule is very unclear. 2 different clues in same row or column are confusing since it's unclear which clue is for what.
And there's no indicator showing if player has filled a row or column correctly or not .
You should give very simple puzzle at first showing game's rules. Start with two grids with one clue then two grids with 2 clues then 2x2 with 2 clues and so on.
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.
