How to Play
- 1
Click a cell and enter a number from 1 to 9.
- 2
Each row, column, and 3×3 box must contain every digit exactly once.
- 3
Use the Notes mode to pencil in candidates.
- 4
Use Hint if you're stuck — but try to solve it on your own first!
ℹ️About This Game
Sudoku is a logic-based number puzzle that became a worldwide phenomenon in the mid-2000s. Though the modern form was popularized by a Japanese puzzle publisher called Nikoli in 1986, its roots trace back to a puzzle called "Number Place" published in the US in 1979. The name "Sudoku" comes from the Japanese phrase meaning "single digit." Every valid Sudoku has exactly one solution, solvable purely through logic — no math or guessing required. Today it's published daily in newspapers and apps worldwide.
💡Tips & Strategy
- 1
Start with rows, columns, or boxes that already have the most numbers filled in.
- 2
Use the "pencil in" (Notes) technique to mark possible candidates in each empty cell.
- 3
Look for naked singles: a cell where only one number is possible.
- 4
Try cross-hatching: for each number 1–9, scan rows and columns to see where it can only go in one box.
❓FAQ
Q. Do I need math skills to play Sudoku?
Not at all! The numbers 1–9 are just symbols. You could replace them with letters or shapes. Sudoku is purely a logic puzzle.
Q. Can a Sudoku have multiple solutions?
A well-made Sudoku puzzle has exactly one solution. If you find two answers, the puzzle is technically flawed.
Q. What's the difference between Easy, Medium, and Hard?
Difficulty is determined by which solving techniques are required. Easy needs only basic scanning, while Hard demands advanced strategies like X-Wing or Swordfish.
