🧩 Jigsaw Sudoku

Sudoku variant with irregular 9-cell regions instead of 3×3 boxes.

Pack

Sudoku Family

Rules

1. Fill each row with digits 1-9 with no repeats.
2. Fill each column with digits 1-9 with no repeats.
3. Fill each irregular region with digits 1-9 with no repeats.

Generation

• Regions are generated first as connected irregular 9-cell groups.
• A complete solved grid is built with MRV-guided recursive backtracking.
• Clues are removed while repeatedly checking uniqueness with a solver.
• Difficulty clue counts:
  • Easy: 40-45
  • Medium: 32-39
  • Hard: 28-31