Sudoku — medium (2026-05-19)

• Begin with singles and hidden singles (especially inside 3×3 boxes).
• Use pencil marks early—Medium puzzles with 46 empties reward candidate elimination.
• Check box-line interactions: if a candidate only fits in one row within a box, it can be removed elsewhere in that row.

• Grid: 9 × 9
• Given cells: 35
• Empty cells: 46
• Starting density: a balanced number of givens

Medium puzzles typically have fewer obvious moves. With 35 givens, expect to use pencil marks and look for hidden singles inside boxes and intersections.

Keep going with another puzzle:

• Try today’s other difficulties: Easy · Hard
• Previous days (Medium): Mon, May 18 · Sun, May 17 · Sat, May 16 · Fri, May 15 · Thu, May 14 · Wed, May 13 · Tue, May 12

How long does today’s Sudoku usually take?

Medium Sudoku often takes 10–20 minutes depending on how quickly you spot hidden singles and candidates.

What are the rules of Sudoku?

Fill the grid so each row, each column, and each 3×3 box contains the numbers 1 to 9 exactly once.

What’s the best first move today?

Start by scanning for rows, columns, or boxes that are nearly complete. With 35 givens, look for cells that have only one possible candidate.