Online Sudoku

Medium (Intermediate) Diagonal Sudoku - Free Online Diagonal Sudoku Puzzles

Play free medium (intermediate) diagonal sudoku online. Challenge yourself with diagonal constraints where both main diagonals must contain digits 1-9.

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Controls

What is medium Diagonal Sudoku?

Diagonal Sudoku is an enhanced variant of the classic Sudoku puzzle that adds diagonal constraints to the traditional rules. This challenging web-based puzzle game requires players to fill a 9×9 grid with digits 1-9 while ensuring that both main diagonals also contain each number exactly once.

Unlike traditional Sudoku, Diagonal Sudoku online features highlighted diagonal lines that create additional constraints. The main diagonal (top-left to bottom-right) and the anti-diagonal (top-right to bottom-left) must each contain all numbers 1-9 without repetition, adding extra logical complexity to the solving process.

Our free Diagonal Sudoku puzzles offer an excellent stepping stone between classic and advanced Sudoku variants. The diagonal constraints provide additional elimination opportunities while maintaining the pure logical nature that makes Sudoku so appealing.

medium difficulty Diagonal Sudoku puzzles are specifically designed for players who have mastered the basics and are ready for intermediate challenges.

How to Play medium Diagonal Sudoku

medium Diagonal Sudoku Rules

  • •Fill the entire 9×9 grid with numbers 1 through 9
  • •Each row must contain all numbers 1-9 without repetition
  • •Each column must contain all numbers 1-9 without repetition
  • •Each 3×3 subgrid must contain all numbers 1-9 without repetition
  • •Main diagonal (top-left to bottom-right) must contain all numbers 1-9 without repetition
  • •Anti-diagonal (top-right to bottom-left) must contain all numbers 1-9 without repetition

Web Sudoku Controls

  • •Click any cell to select it
  • •Use keyboard numbers 1-9 to fill cells
  • •Press 'D' to toggle draft mode for notes
  • •Use Delete/Backspace to clear cells
  • •Click the Hint button for assistance (3 hints per puzzle)

Medium Diagonal Sudoku Solving Techniques

Medium Diagonal Sudoku puzzles contain 30-39 clues, requiring balanced use of all constraint types. Develop systematic approaches for checking all four constraint types (row, column, box, diagonal) for each placement. Look for cells that lie on diagonals as they often provide breakthrough moments.

Key Techniques for Medium Diagonal Sudoku:

  • ✓Diagonal Pairs: Identify when two cells on a diagonal can only contain the same two numbers, eliminating these from other diagonal cells.
  • ✓Diagonal-Box Intersections: Use the overlap between diagonals and 3x3 boxes to create powerful elimination chains.
  • ✓Multi-Constraint Analysis: Simultaneously consider row, column, box, and diagonal constraints to narrow down possibilities.
  • ✓Diagonal Chains: Create logical chains using diagonal constraints to solve cells that seem impossible through standard methods.
  • ✓Cross-Pattern Recognition: Identify patterns where diagonal constraints interact with rows and columns in specific ways.
  • ✓Diagonal Forcing: Use the fact that certain numbers must appear in specific positions on diagonals to force other placements.

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