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Killer Sudoku

Expert

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Play Expert Killer Sudoku — ThePuzzleLabs

Try this Expert 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 expert killer sudoku

Expert killer sudoku gives you zero given digits and cages up to 6 cells. The opening board is completely blank except for cage outlines and sum labels. Everything comes from deduction.

Cage interaction chains are the main addition at this level. When two cages share cells in the same row, their constraints interact. If cage A in row 3 must contain {1, 3, 5} and cage B in the same row must contain {2, 4}, the remaining cells in that row are constrained to {6, 7, 8, 9}. Chain these interactions across intersecting cages and you can eliminate candidates that no single technique would catch.

At this level, solving is slow and methodical. Full candidate lists are not optional. Write down every possibility for every cell, then work through eliminations systematically. The 45 rule, combination filtering, and cage interactions together will crack every expert puzzle. When expert feels manageable, our Einstein puzzles are waiting.