SUDOKU DAILY
1 Attempt Per Day • 24h Lock
STREAK: 0D WINS: 0 BEST: --:-- PERFECT: 0
TIME: 00:00FILLED: 35/81MISTAKES: 0/3
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PC: 1-9, Ctrl+Z (Undo), N (Notes), Arrows Touch: Tap & Keypad
Advanced Level
Hard Sudoku Online – Free Advanced Daily Logic Grids
Test your cognitive limits with Hard Sudoku on ZokoPlay! Featuring only 25-28 given digits, these puzzles cannot be solved by simple scanning. Advanced techniques like Naked Pairs, Box-Line Reduction, and X-Wing deduction are essential.
Advanced Solving Techniques for Hard Grids
- Naked Pairs & Triples: When two cells in a unit contain only the same two candidates, those two numbers can be eliminated from all other cells in that unit.
- Box-Line Reduction: When candidates in a block are confined to a line, eliminating them from the intersecting row or column outside the block.
- X-Wing Pattern: When a candidate appears exactly twice in two different rows and they share columns, eliminating that candidate from the entire rest of those columns.