Sudoku

A new puzzle is built from a complete, valid solution and reduced to a set of clues with exactly one solution, so every game is fair and fully solvable. Fill the grid so every row, column and bold-bordered box contains each number exactly once, with no repeats.

Pick a grid size and difficulty below, tap a cell to select it, then enter a number with your keyboard or the number pad. Gold cells are numbers you've entered; bold dark cells were given to you at the start.