Numdoku. Daily Killer Sudoku

Killer Sudoku with cage sums — now with improved sharing and challenge features. Master advanced techniques with smart hints that teach you to solve.

Killer Sudoku, beautifully reimagined.

Numdoku is Killer Sudoku — the number puzzle where logic meets arithmetic. Cells are grouped into cages, each with a target sum. Fill every cage so the digits add up to the target, with no digit repeating inside the same cage. Then apply classic Sudoku elimination to complete the 9x9 grid. It's the next level of number puzzles.

Whether you're a Sudoku veteran craving a richer challenge, or a newcomer ready to sharpen your arithmetic reasoning — Numdoku meets you where you are.

KILLER SUDOKU, DONE RIGHT • Cages clearly highlighted with target sums displayed • No digit repeats within any cage — a core rule, elegantly enforced • Every puzzle is uniquely solvable using pure logic — no guessing required • Cage-solving techniques taught through a built-in technique library • Smart hints reveal the next logical step without giving away the solution

FOUR DIFFICULTY LEVELS • Easy: Perfect for cage puzzle newcomers and quick brain warm-ups • Medium: A satisfying challenge that builds cage intuition • Hard: Combine Sudoku elimination with multi-cage arithmetic reasoning • Expert: Master complex cage interactions and advanced strategies • Progress naturally from one level to the next as your skills grow

DAILY CHALLENGES • A fresh Killer Sudoku puzzle every day, identical for players worldwide • Build your streak and track your progress on the calendar • Compete on global leaderboards and see how you rank • Choose your daily difficulty or let it rotate automatically • Never miss a day — push notifications remind you to play

ELEGANT DESIGN • Clean, minimal aesthetic that keeps the focus on the cages • Twelve beautiful color themes with light and dark variants • Refined typography designed for easy reading at any size • Smooth animations and a responsive, native feel • Dark mode for comfortable late-night puzzle sessions • Landscape and portrait orientation support • Designed to look gorgeous on every screen size

SMART TOOLS THAT HELP, NOT HINDER • Pencil marks for noting candidates in each cell • Unlimited undo and redo — experiment freely • Optional error highlighting to catch mistakes early • Intelligent hints when you need a nudge, not the answer • Auto-save ensures you never lose your progress • Highlight matching numbers to spot patterns instantly

TRACK YOUR PROGRESS • XP system with 100 levels to achieve • 60 achievements across 8 categories to unlock • Personal statistics for each difficulty level • Win streaks and personal best times • Game Center integration for competing with friends • Cloud sync keeps your progress safe across all your devices

PLAY YOUR WAY • Works completely offline — play anywhere, anytime • No account required to start playing immediately • 70+ languages supported with full localization • VoiceOver screen reader support for accessibility • High contrast themes for comfortable viewing • No forced tutorials — jump right into the cage puzzle • Free to play with no paywalls blocking content

WHY KILLER SUDOKU? Standard Sudoku is a classic. Killer Sudoku adds an arithmetic layer that unlocks an entirely new dimension of logic. You're not just eliminating numbers by row and column — you're reasoning about which combinations of digits can fit a cage sum, eliminating possibilities across intersecting cages, and chaining deductions that make each solve deeply satisfying.

Numdoku is that experience, polished and perfected. Download now and discover Killer Sudoku at its best.

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