Online Sudoku

Easy Diagonal Sudoku – Play Free Online

Add a diagonal twist to your logic with free easy Diagonal Sudoku puzzles online. Also known as X Sudoku—perfect for solvers ready to master the diagonal constraint. Play instantly on any device.
No download · No signup · Solvable deals · Play in your browser
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Controls

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What is Easy Diagonal Sudoku?

Easy Diagonal Sudoku, also known as Easy X Sudoku or Easy Sudoku X, adds two main diagonal constraints to classic Sudoku for a fresh, beginner-friendly twist.

You follow the classic row, column, and 3×3 box rules, plus a diagonal constraint: both main diagonals must contain digits 1–9 without repetition.

With 35-40 given numbers, this level helps you learn diagonal elimination gently. It is slightly tougher than easy Classic Sudoku, but still very approachable.

Why Play Easy Diagonal Sudoku Online?

Our web-based Sudoku platform is built for speed and focus:

  • •⚡ Instant play — no download or signup required
  • •📱 Fully responsive — works on mobile, tablet, and desktop
  • •🧩 Unlimited easy Diagonal Sudoku puzzles
  • •🧠 Designed for brain training and logic improvement

Whether you're looking for a fresh Sudoku twist or want to master diagonal constraints, this is the perfect place to play easy Diagonal Sudoku online for free.

How to Play Easy Diagonal Sudoku

Basic Rules

  • •Fill the 9×9 grid with numbers 1–9
  • •Each row must contain all digits without repetition
  • •Each column must contain all digits without repetition
  • •Each 3×3 box must contain all digits without repetition
  • •❌ Diagonal Rule: Both main diagonals must contain digits 1–9 without repetition

Controls (Web Sudoku)

  • •Click a cell to select it
  • •Use keyboard (1–9) to enter numbers
  • •Press D to toggle notes (draft mode)
  • •Use Delete/Backspace to clear cells
  • •Use hints when needed (limited per puzzle)

🧩 Easy Diagonal Sudoku Solving Techniques

Easy Diagonal Sudoku adds two extra constraint lines that create new eliminations.

Scan normally, then use the main diagonal to remove candidates and force singles.

Key Techniques:

  • ✓Classic Scanning — Start with rows, columns, boxes
  • ✓Diagonal Elimination — Remove candidates on the diagonal
  • ✓Diagonal Singles — A digit fits only one diagonal cell
  • ✓Cross-Constraint — Diagonal placements constrain rows/cols
  • ✓Candidate Checking — Track all five constraint types
  • ✓Hidden Singles on Diagonal — Forced by diagonal constraint

Easy Diagonal Sudoku FAQ

What is Easy Diagonal Sudoku and how does it work?

Easy Diagonal Sudoku follows classic Sudoku rules but adds a twist: both main diagonals must also contain digits 1–9 without repetition. Easy puzzles provide more direct placements and simpler logic.

What are the rules of Diagonal Sudoku for beginners?

Each row, column, and 3×3 box must contain 1–9. Both main diagonals must also contain 1–9 with no repeats.

How do you solve Easy Diagonal Sudoku step by step?

Start with obvious placements in rows, columns, and boxes. Then use the diagonal constraints to eliminate possibilities and fill remaining cells.

Is Easy Diagonal Sudoku harder than classic Sudoku?

Not necessarily. The diagonal rule actually provides extra constraints, which can make Easy puzzles easier to solve than standard Sudoku.

What is the best beginner strategy for Diagonal Sudoku?

Focus on intersections between diagonals and boxes. These often give quick wins and help reduce candidate numbers early.

🎯 Play Easy Diagonal Sudoku Online Now

Start solving instantly with our free easy Diagonal Sudoku puzzles. No signup, no distractions—just pure logic gameplay with a diagonal twist.

👉 Play now and master the X Sudoku challenge today.

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