Sudoku is an intellectual puzzle with a grid shape of 9x9 empty cells. You can only use numbers 1 to 9. Each block consists of 3×3 blank cells that can only contain numbers 1 to 9. Each vertical row can only contain numbers from 1 to 9. Each horizontal row can only contain numbers from 1 to 9. Each number in the 3×3 block, vertical or horizontal, cannot overlap. The puzzle is solved when all the numbers on the entire Sudoku grid are filled in correctly. There are three game modes including easy, medium and hard. Each level will have three separate levels. You can press the reset button to play again from the beginning. Click the clear button to clear the current cell. Click the check button to check the game results