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 hard is Medium Sudoku?

Accepted Answer

Medium Sudoku keeps about 45% of the digits as givens. It requires techniques like elimination and hidden pairs to reason through the puzzle, sitting between easy and hard difficulty.

Question 7

Who is Medium Sudoku suitable for?

Accepted Answer

Medium Sudoku is designed for intermediate players who have mastered the basics and want to improve their reasoning skills. It's the ideal bridge from beginner to expert level.

Question 8

What techniques are useful for Medium Sudoku?

Accepted Answer

Start with cross-hatching (row and column elimination within boxes), then apply hidden singles and naked pairs. Focus on cells with the fewest candidates first to gradually narrow down possibilities.

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