Sudoku 
Brain 
Logic 
Numbers What is Sudoku?
Fill a 9x9 grid with digits 1-9 without repetition in any row, column, or subgrid. Utilize real-time error checking and note-taking for advanced deduction.
How to Play
Solving at a Master level depends on "Candidate Elimination Logic." Instead of searching for where a number can go, look for where it must go. Utilize the "Naked Pair" technique: if two cells in a block can only contain the same two numbers, you can eliminate those numbers from all other cells in that block. A pro strategy is to identify "Locked Candidates"—situations where a number in a row also belongs to a specific 3x3 subgrid, allowing you to clear potential spots in adjacent columns.
Pro Tips
Use "Candidate Elimination Logic." Look for "Naked Pairs"—if two cells in a block can only be the same two numbers, eliminate those from all other cells in that block.
Frequently Asked Questions
Are there difficulty levels?
Yes, ranging from "Easy" to "Expert." Expert levels require advanced techniques like "X-Wing" and "Swordfish" patterns to solve.
What is the Notes feature for?
Notes track "Possibility States." This is essential for hard puzzles where you must cross-reference multiple rows before confirming a digit.
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