Sudoku Sensei is a free daily sudoku game for players who want a real challenge. Fill the 9x9 grid so every row, column, and 3x3 box contains the digits 1 through 9, with no repeats. Choose your difficulty level, from beginner to advanced, and sharpen your logic and concentration with every puzzle. One of the best brain games you can play online, free and ready in your browser with no download needed.