Play free Sudoku online at Luzu.in. Choose Easy, Medium or Hard difficulty and solve the classic 9×9 number puzzle. Tap a cell, then tap a number to place it. Green means correct, red means wrong. Use the Hint button if you get stuck. No download, no sign-up needed.
Fill the 9×9 grid so every row, every column, and every 3×3 box contains the digits 1 through 9 exactly once. Tap a blank cell to select it, then tap a number to place it. Green means correct, red means the number conflicts with another cell.
Easy Sudoku has more pre-filled numbers and can be solved with simple techniques. Medium requires some logical deduction. Hard Sudoku has fewer given numbers and requires advanced techniques like elimination and backtracking.