Master Sudoku

A full 9x9 grid waits to be completed in Master Sudoku. Eighty-one cells hold digits from 1 to 9, and the full board accepts only one valid arrangement. Three difficulty modes change the amount of preset numbers on the grid. Easy gives more filled cells, Normal strips some away, and Hard leaves less information to work with. This Sudoku puzzle game tracks your finish time, pushing shorter runs on later attempts.

How to play?

Examine a 3x3 box with many preset digits. Find the missing number and place it in the empty cell. The same digit can't appear twice in a row, a column, or a 3x3 box. Red color and a beep appear right away after a wrong placement. Move across the board, box by box, then check the full lines and vertical columns before adding more numbers. Five hints are available in each difficulty mode. Use them carefully when the grid stops moving forward.