Sudoku Game

This is a playable sudoku game. The purpose of the game is to get each row, column, and 3×3 square to contain the numbers 1 through 9 with no duplicates. The level of difficulty determines how many blank squares appear in the puzzle. Click any blank square and select a value for that square from the popup menu. Check your solution with the "check" button. You can peek at a solution for the puzzle at any time. Click the "new puzzle" button to generate a new puzzle. Note that when the difficulty level is high, it is possible that more than one correct solution exists for a puzzle. Only one correct solution will be shown, but the "check" button will verify a correct solution even if it differs from the solution shown.