Sudoku

• Goal: fill the grid with numbers so that every row, every column and every bold-bordered box contains each number exactly once.

• Easy mode uses a 6×6 grid with numbers 1–6 and 2×3 boxes.

• Normal and Hard use a 9×9 grid with numbers 1–9 and 3×3 boxes.

• Pre-filled numbers cannot be changed.

• If you place a number in the wrong cell, it turns red.

• Use the pencil icon to add small note numbers to cells as hints.

Choose difficulty