Dokku: Killer Sudoku

Killer sudoku with cage sums – a calm logic puzzle you can actually finish.
No given digits: every cage shows a sum, and the digits inside add up to it.

Place 1–9 once in every row, column and box. Inside a dashed cage the digits never repeat and add up to the small number in its corner. Tap a cell, tap a digit – or switch on the pencil for notes.

• 240 levels in 8 worlds – from a 4×4 tutorial through 6×6 to big 9×9 cages, one new technique at a time
• A real ending – finish the career and earn the Dokku master title. No endless grind.
• Daily killer sudoku – the same puzzle for every player, keep your streak
• Free training – endless new puzzles from Easy to Expert
• Smart hints – a hint shows the next cell you can work out, never the whole answer
• Notes, Undo, highlights – rows, columns, boxes, cages and same digits light up
• Relaxed mistakes – three hearts, and you can always continue

Every puzzle has exactly one solution and is solved by logic, never by guessing.

Ads only between levels, never in the middle of a puzzle. Dokku+ is a one-time purchase that removes full-screen ads – no subscription.

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