Expert Sudoku
Welcome to Expert Sudoku, where puzzles push the boundaries of logical deduction and strategic thinking. This difficulty level is designed for advanced solvers who enjoy complex challenges requiring sophisticated solving techniques.
Techniques You'll Need
- Bivalue Universal Graves (BUG)
A technique for puzzles where almost all unsolved cells have exactly two candidates, creating forced logical deductions
- Aligned Pair Exclusion
Identifying when pairs of candidates in aligned cells would create impossible patterns, forcing certain placements
- X-Chains
Chains of strong and weak links for a single candidate that allow for eliminations at specific points in the chain
- Remote Pairs
Chains of bivalue cells with the same two candidates that create elimination opportunities
Expert Challenge
These puzzles represent some of the most challenging logical deductions in Sudoku. You'll need to master multiple advanced techniques and often use them in combination. Expert mode puzzles require careful analysis, strategic thinking, and the ability to visualize complex patterns across the entire grid.