ThePuzzleLabs

Killer Sudoku

Medium

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Play Medium Killer Sudoku — ThePuzzleLabs

Try this Medium Killer Sudoku puzzle on ThePuzzleLabs.

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Classic

How to Play Killer Sudoku

Rules

  • Fill every cell with digits 1–9.
  • Each row, column, and 3×3 box must contain 1–9 exactly once.
  • Dotted cages have target sums — digits in a cage must add up to the number shown.
  • No digit may repeat within a cage.

Keyboard Shortcuts

  • 1-9 Place digit
  • Delete Erase cell
  • ↑↓←→ Navigate
  • N Toggle notes
  • U Undo
  • H Hint

Solve This Puzzle?

This will fill in the complete solution. The puzzle will be marked as “solved with reveal” rather than self-solved.

About medium killer sudoku

Medium killer sudoku drops your given digits to between 10 and 19, and cages grow up to 4 cells. The extra cage size multiplies the number of valid digit combinations, so you can't just memorize answers anymore. You have to actually think about which combinations fit the surrounding constraints.

Hidden singles matter here. A hidden single is a digit that can only go in one cell within a row, column, or box, even though that cell has multiple candidates. You find these by writing down candidates for a group of cells and noticing that a particular number only appears once. Pair this with cage-sum elimination, and most medium puzzles open up.

The combinations reference is worth bookmarking at this level. When you hit a 4-cell cage with sum 22, it saves time to look up the valid combinations rather than figuring them out from scratch each time. Once medium feels routine, move to hard.