Beach Sudoku

Sun and sand frame a 9x9 number grid in Beach Sudoku. Digits sit on a board drawn right into the beach, with lines in the sand separating the 3x3 sections. Three difficulty settings change how many numbers are already placed before the puzzle begins, and each setting runs under its own time limit. Fill the empty spaces with the right digits to complete the full board correctly.

How to play?

Select a square and place a number from 1 through 9. No row can contain the same digit twice, and no column can repeat one either. Inside every 3x3 section, use all numbers from 1 to 9 once with no duplicates. Reselect a square to fix a wrong entry. Finish the grid before time runs out, then post a personal record in each difficulty setting.