Sudoku
Classic number logic, no guessing
Sudoku is a logic puzzle played on a 9×9 grid split into nine 3×3 boxes. Fill every empty cell with digits 1-9 so each row, column, and box contains each digit exactly once.
Rules
Each empty cell must contain exactly one digit from 1 through 9.
Every row must contain all digits 1-9 with no duplicates.
Every column must also contain all digits 1-9 with no duplicates.
Each 3×3 box must contain digits 1-9 exactly once.
Strategies & Tips
Scan Singles First
Start with rows, columns, or boxes that already contain many numbers. Fewer missing digits means easier placements.
Use Pencil-Mindset Candidates
For each empty cell, mentally test which numbers are blocked by row, column, and box. If only one candidate remains, place it.
Cross-Hatch Boxes
When a number is constrained within a box, use row/column eliminations to locate its exact cell.
Avoid Guessing
Daily Sudoku puzzles are designed to be solved with logic. If stuck, move to another region and gather more constraints.