Hi, the challenge is – Sudoku validation and we need to make sure that Each row in the puzzle is exactly 1 through 9. No duplicates. Example boards: https://upload.wikimedia.org/wikipedia/commons/e/e0/Sudoku_Puzzle_by_L2G-20050714_standardized_layout.svg https://upload.wikimedia.org/wikipedia/commons/1/12/Sudoku_Puzzle_by_L2G-20050714_solution_standardized_layout.svg Solution: Result: Look you can use other ways to check if an array have a duplicated element, check my post about some solutions: By Cristina … Continue reading Sudoku validation “no duplicate elements in rows” Js