About This Game

Play - Efficient Input System

Tired of slow manual input of candidates and making mistakes? Our unique cell+skill input system revolutionizes the way you play Sudoku. Simply spot a pattern like an X-Wing, select a relevant cell, click the "Fish" skill, and watch the eliminations happen automatically. No more manual candidate management or fear of errors—the game handles the work, letting you focus on the fun of solving. If the skill doesn't apply to the cell, nothing will happen, ensuring a completely error-free experience.

Key features:

• Select a cell and use a "skill" for efficient, error-free input
  
• Smart hint system when you're stuck
  
• Full Undo/Redo functionality
  
• Excellent keyboard support

Campaign - From Beginner to Expert

Whether you're a complete novice or looking to sharpen your skills, our campaign mode is your path to expertise. We guide you step-by-step from the absolute basics to competition-level strategies. Learn to spot Naked/Hidden Singles, master Hidden and Naked Sets, and conquer complex patterns like X-Wings, XYZ-Wings, and Skyscrapers. With clear, easy-to-understand explanations, clear diagrams, and targeted practice puzzles, you'll understand the "why" and "how" behind every move.

Analyze - Study Puzzles

The Analyze feature searches the Sudoku grid to find all possible techniques that can be applied, along with text explaining the elimination logic. It's great if you want to learn how to solve a specific puzzle, or study specific techniques.

Sudoku Editor - Create Your Own Puzzles

Found a great puzzle you want to play? Want to design unique puzzles to challenge your friends? Sudoku Editor lets you create puzzles freely. Of course, if you prefer not to build them yourself, the generator creates fresh, high-quality puzzles on demand, from easy to expert. You can even choose symmetry patterns to create visually elegant and challenging puzzles.

Master Techniques with Partial Puzzles

Want to master a specific technique like Hidden Triple? Our partial puzzles in Custom Game let you practice just that. You will be presented with a puzzle advanced to the exact point where you only need to find the pattern and do the eliminations. It's the most efficient way to practice specific techniques.

Sudoku Paint - Create Sudoku Images

Create and share beautiful visual diagrams of your solving strategies. Use tools to highlight cells and candidates, draw chains, add text, and export your creations.

Supported Techniques

The game's play and analysis are based on our high performance Sudoku Solver, which supports a wide range of techniques, including:

• Naked Sets (Naked Singles, Pairs, Triples, etc.)
  
• Hidden Sets (Hidden Singles, Pairs, Triples, etc.)
  
• Fish Patterns (Pointing, Claiming, X-Wing, Swordfish, Jellyfish, Finned Fish, Mutant Fish etc.)
  
• XYZ-Wing Family (XY-Wing, XYZ-Wing, and generalized versions of XYZ-Wing)
  
• Unique Rectangles (Types 1-4, Type 6, Hidden Rectangle, Avoidable Rectangle etc.)
  
• BUG Patterns (Bivalue Universal Grave - Types 1-4)
  
• AIC Chains (Alternate Inference Chains, including X-Chains, XY-Chains, Remote Pairs, Two-String Kite, Skyscraper etc.)
  
• ALS Chains (Almost Locked Set Chains and Loops, including AKA ALS-XZ, ALS-XY-Wing etc.)
  
• ALS Blossom (Almost Locked Set Blossom patterns, AKA Death Blossom)
  
• Sue de Coq

Note: Grouped Chains(including Empty Rectangle), Unique Loop and Extended Rectangle are NOT implemented as they are too advanced for most players.

Note: It is NOT recommended to play this game on Steam Deck.

Note: This game supports ONLY standard 9x9 Sudoku rules. No variants (e.g., Killer Sudoku) are included.