Sudoku 4 Levels of Difficulty

Four puzzle settings are available in Sudoku 4 Levels of Difficulty. Easy places more digits on the board, medium removes more of them, hard leaves fewer clues, and expert cuts the grid down to a sparse layout. The full Sudoku rule set stays intact in every mode, with rows, columns, and 3x3 boxes working from the same pool of numbers. No paper is needed here. The board is ready in the browser, and the original digits already placed in the grid belong to the final solution.

How to play?

Pick a number, then place it into an empty cell. Fill the board with digits 1 through 9 without repeating a value in any row or column. The same restriction applies inside every 3x3 box. Select any cell to view its row, column, and box highlight. Use that marked area to rule out digits before placing a value. Fill mini-boxes with the most given numbers first. Rows can still be checked afterward, though their order across the grid may vary.