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

How do I print Sudoku puzzles?

Accepted Answer

Choose your preferred variant (4×4, 6×6, or 9×9) and difficulty in the generator, batch generate puzzles, then click the print button to open your browser's print dialog.

Question 7

What paper size is used for printing?

Accepted Answer

The print layout is optimized for A4 paper (210mm × 297mm), ensuring clean grids and proper formatting for most home and office printers.

Question 8

Does the print layout support multiple puzzles per page?

Accepted Answer

Yes. You can choose 1, 2, or 4 puzzles per page. The layout automatically adjusts cell sizes based on the grid variant and number of puzzles per page.

Question 9

Can I print answer sheets separately?

Accepted Answer

Yes. Enable "Include answers" and then "Separate answer sheet" to print all puzzles first, followed by answer pages. You can also show answers inline on the same page.

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