This is a warm-up (meant to need no notations, visual look only) for Classic Sudoku in Just One Cell Sudoku format; everything else this week will be harder.

PDF

or solve online in Penpa, or also solve online in SudokuPad as a new option we’re exploring for Sudoku.

Theme: Just Pi

Author/Opus: This is the 1st puzzle from guest contributor Philip Newman.

Rules: This Sudoku does not have a unique solution for the full grid (it actually has a large number of solutions), but there is exactly one cell in which a number can be logically placed that is fixed across all solutions. Find this cell and its unique value.

This puzzle follows Classic Sudoku rules, so no number repeats in any row, column, or bold region.

Time Standards: This competition had 1-point (easy), 2-point (medium), 3-point (hard), or higher value puzzles. This would be ~0.5 points (30 seconds or less for top solvers).

Solution: PDF

Note: Follow this link for other Just One Cell Sudoku.

Note 2: Comments on the blog are great! For a more interactive discussion, please also consider using our Just One Cell Sudoku Discussion post on the GMPuzzles Discord.