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Kakuro

Hard

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Play Hard Kakuro — ThePuzzleLabs

Try this Hard Kakuro puzzle on ThePuzzleLabs.

00:00
Classic
15
10
11
7
8
5
9
8
9
12
8
14
13
10
14
5
5

How to Play Kakuro

Rules

  • Fill every white cell with a digit from 1 to 9.
  • Each clue number shows the sum of its entry (horizontal or vertical run of white cells).
  • No digit may repeat within an entry.
  • Clue cells show across sums (bottom-left) and down sums (top-right), separated by a diagonal.

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 hard kakuro

Hard kakuro uses large grids (10 to 12) with dense layouts. The number of entries grows significantly, and you need to manage candidates across many intersecting constraints.

Combination filtering is the key technique at this level. For each entry, list all valid digit combinations that sum to the clue. Cross out combinations where any digit conflicts with what you already know from crossing entries. When only one combination survives, every cell in that entry is determined.

Hard puzzles are solvable without guessing. If you feel stuck, step back and check whether you've applied cross-entry elimination to every cell in a problematic area. There's usually a constraint you haven't fully exploited.