Sudoku Medium

A 9x9 grid sets the pace here. In Sudoku Medium, medium difficulty sits between beginner boards and the sparsest layouts, giving you hundreds of classic number puzzles on an 81-cell board split into nine 3x3 boxes. Digits 1 through 9 must appear once in every row, once in every column, and once in every box. The board changes with the number of prefilled digits. More given numbers leave less to place, and fewer clues leave more blanks to solve.

How to play?

Fill an empty cell with the digit that belongs there. Pick a blank space, then enter a number from the side panel or type it directly. A correct input drops into the cell and lights up blue. A wrong choice lights up red, marking the error. Use notes for trial values during the puzzle. Switch the pencil mode on to place note digits in a cell. Switch it off to enter regular numbers again. New medium Sudoku puzzles appear daily, and the game runs in a browser at any time.