Keep candidate notes current
After placing a digit, remove it from notes in the same row, column, and box so old candidates do not mislead you.
Medium Sudoku Online
Medium Sudoku adds just enough resistance to make candidate notes useful while keeping every puzzle approachable with steady logic.
What makes a Medium Sudoku?
Medium puzzles on Sudoku Hot start with about 32 given digits. With fewer anchors than Easy, you will scan across several rows, columns, and boxes before a placement becomes certain.
Expect naked and hidden singles plus occasional locked candidates or simple pairs. The aim is to connect small deductions, not to guess between two possible numbers.
Solving tips
Look for hidden singles
A cell can show several candidates while still being the only place for one digit within its row, column, or box.
Rescan after every breakthrough
One confirmed digit can open a chain of easier singles nearby. Pause and scan before pursuing a harder pattern.
When should you try Hard Sudoku?
Try Hard when Medium puzzles feel predictable and your notes stay accurate throughout a solve. Hard grids require longer eliminations and more deliberate pattern spotting.
Try another Sudoku difficulty
Solve your own puzzleSudoku FAQ
Do Medium Sudoku puzzles require guessing?
No. A well-formed Medium puzzle can be solved with logic. Candidate notes, hidden singles, locked candidates, and simple pairs are usually enough.
What should I do when stuck on Medium Sudoku?
Check that your notes are current, then scan each digit across all boxes. Look for a digit that appears in only one candidate cell within a row, column, or box.