Medium Sudoku Puzzles

Check out a set of free printable medium Sudoku puzzles to test your brain. Great for Sudoku fans, these puzzles are a fun and exciting way to boost focus, attention, and problem-solving skills. Download, print and have fun solving today!

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About Classic Sudoku Puzzles

Sudoku is a logic-based, popular number-placement puzzle. The classic Sudoku grid consists of a 9×9 board divided into nine 3×3 sub-grids called "boxes" or "regions." The goal is to fill the grid with digits from 1 to 9 so that each digit appears exactly once in each row, column, and box.

Sudoku puzzles vary in difficulty, ranging from easy to expert, depending on how many digits are pre-filled and the complexity of solving them.

Basic Rules / How to Play

  • Grid Size: The puzzle has typically 9x9 grid size made up of three 3x3 sub-grids. The other variation can be of 4x4, 6x6, 10x10, 16x16 etc.
  • Rows: Each row must contain all digits from 1 to 9. No digit can be repeated within a single row.
  • Columns: Each column must contain all digits from 1 to 9. No digit can be repeated within a single column.
  • Box: Each 3×3 box must contain all digits from 1 to 9. No digit can be repeated within any of the nine 3×3 subgrids.
  • Pre-Filled Numbers: The numbers given at the start of the puzzle must remain unchanged.

Solving Tips and Techniques:

  • Most Pre-filled Numbers: Start with rows, columns, or boxes with the most pre-filled numbers.
  • Scanning: Look for empty cells where only one number is possible based on the existing numbers in the row, column, and 3x3 subgrid.
  • Elimination: If a number can only go into one cell in a row, column, or box, place it there.
  • Single Candidates: A cell that can only have one number is filled right away.
  • Candidate Lists: Write all the possible numbers in each empty cell. As you fill in numbers, remove the ones that no longer work.
  • Naked Pairs / Triples: If two (or three) cells in a row, column, or box can only have the same two (or three) numbers, remove those numbers from the other cells in that row, column, or box.
  • Hidden Pairs / Triples: Find numbers that show up in only two or three cells in a row, column, or box, even if there are other possible numbers too.
  • Guess and Backtrack: For very challenging puzzles, guess a number and follow through to see if it leads to a valid solution. If not, backtrack and try another possibility.
  • Use pencil and paper: Use pencil marks to keep track of possible numbers in each cell