Evil Sudoku

Generating puzzle...

Evil

Time: 00:00

Hints: 0

Mistakes: 0

Evil Sudoku is a great choice for players who already know different types of Sudoku and want to try something truly difficult. These puzzles require not only knowing the basic rules but also using advanced methods and strategies.

What makes our Evil Sudoku different

Our Evil Sudoku puzzles come with a high SE rating, starting from 4.0 and sometimes going well beyond 8.7.

SE (Sudoku Explainer) is a system used to measure the logical difficulty of a puzzle. The higher the SE rating, the deeper the level of reasoning required to solve it without guessing. While Easy and Medium puzzles are usually completed using straightforward techniques, Evil Sudoku sits in the upper SE range and requires more sophisticated logic, careful planning, and full candidate analysis.

Techniques required for solving Evil Sudoku

Our Evil Sudoku puzzles are designed for players who rely on structured logical reasoning rather than trial and error. At this level, basic approaches are no longer sufficient. Progress depends on recognizing and applying advanced techniques, patterns, and chains, as shown in the table below.

Difficulty Range	Techniques You Will Need
Core Evil techniques	X-Wing, Swordfish, Skyscraper, Two-String Kite, Crane, Short Forcing Chains
Advanced logic patterns	Y-Wing, XYZ-Wing, Hidden Quadruple, Naked Quadruple, Empty Rectangle
Finned & extended patterns	Finned X-Wing, Sashimi X-Wing, Finned Swordfish, Sashimi Swordfish, Jellyfish, Finned Jellyfish
Chain-based reasoning	Simple Coloring, BUG (Binary Universal Grave), X-Chain, XY-Chain, Grouped X-Chain
High-level Evil techniques	Alternating Inference Chains (AIC), Extended Y-Wing structures
Deep forcing logic	Nishio Forcing Chain, Cell Forcing Chain, Region Forcing Chain, Forcing Nets

Tips for playing Extreme Evil Sudoku

Use notes to mark possible numbers in each cell. This makes it easier to track your options
Pay attention to areas where several rules overlap. These places often give useful hints
Look for repeating patterns or symmetry. This can help you find the right moves faster
Try to imagine how placing one number affects the rest of the puzzle
Move step by step and avoid random guesses. A calm and logical approach works best

Even with these tips, Extreme Evil Sudoku puzzles can feel very challenging. But this is what makes them so engaging. As you work through them, you train your focus and thinking, and you get a great sense of achievement when everything finally falls into place.

If you want to test yourself at the highest difficulty and check how strong your logical thinking really is, try extreme Evil Sudoku. It offers a rewarding experience and gives you the joy of solving puzzles that only a few players can complete.