Question 1

What is a Sudoku puzzle?

Accepted Answer

Sudoku is a logic-based number placement puzzle. The goal is to fill a grid with digits so that every row, column, and box contains each number exactly once. The most common format is 9×9, but 4×4 and 6×6 variants are great for beginners.

Question 2

How many solutions can a Sudoku puzzle have?

Accepted Answer

A properly constructed Sudoku puzzle has exactly one unique solution. Our generator verifies every puzzle using a backtracking solver with MRV heuristics — if removing any cell would create multiple solutions, that cell is kept. This guarantees every puzzle is solvable through pure logic without guessing.

Question 3

Can I print Sudoku puzzles?

Accepted Answer

Yes. After generating puzzles, click the Print button. You can choose 1, 2, or 4 puzzles per page, include answer sheets, and print on A4 paper. The layout is optimized for clean printing with clear grid lines and completion time fields.

Question 4

What is the difference between easy and hard Sudoku?

Accepted Answer

Difficulty is determined by how many cells are pre-filled. Easy puzzles keep about 60% of cells filled, Medium about 45%, and Hard about 30%. Fewer clues means more complex deduction is required. All difficulty levels guarantee a unique solution solvable by logic alone.

Question 5

Can I generate multiple Sudoku puzzles at once?

Accepted Answer

Yes. You can batch generate 1, 2, 4, or 6 puzzles at once. This is ideal for teachers preparing classroom materials, daily practice sheets, or puzzle books. Each puzzle is independently generated with a guaranteed unique solution.

Question 6

What is 6×6 Sudoku?

Accepted Answer

6×6 Sudoku uses a 6×6 grid divided into six 2×3 boxes, filled with digits 1-6 so each row, column, and box contains unique digits. It's an intermediate variant between 4×4 and 9×9 Sudoku.

Question 7

How do you play 6×6 Sudoku?

Accepted Answer

Fill the 6×6 grid with digits 1-6 so each row, column, and 2×3 box contains every digit exactly once. Cross-reference rows, columns, and boxes to deduce each cell.

Question 8

What difficulty levels are available for 6×6 Sudoku?

Accepted Answer

6×6 Sudoku supports easy, medium, and hard difficulty levels. Easy provides more given digits for beginners; hard offers fewer clues requiring more advanced reasoning.

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