Daily Killer Sudoku

More Daily Puzzles

Try a different daily sudoku variant. Each uses the same system — one new puzzle per day, same for everyone, with streaks and sharing.

Daily Killer Sudoku: A Free Cage-Sum Puzzle Every Day

Welcome to Daily Killer Sudoku — a fresh cage-sum puzzle delivered every day at midnight. Unlike our unlimited Killer Sudoku mode, the daily version gives you one puzzle per day that's identical for every player worldwide. It's the same addictive blend of Sudoku logic and arithmetic you love, wrapped in a shared daily challenge where you can compare times, build streaks, and share spoiler-free results.

Killer Sudoku has grown from a niche Japanese puzzle into one of the most popular Sudoku variants worldwide because it adds a satisfying arithmetic layer to the classic logic. Our daily version follows the tradition of newspaper puzzle columns — one puzzle per day, progressively harder through the week — with modern features like streak tracking, a full puzzle archive, and instant sharing.

🎯 What Makes Daily Killer Sudoku Special?

Daily Killer Sudoku combines two powerful hooks: the social element of a shared daily puzzle (like Wordle) and the deeply satisfying logic of Killer Sudoku. Every player gets the same cage layout, the same sums, and the same solution — so when you share your results, the comparison is meaningful. Did your friend spot the Rule of 45 shortcut that shaved two minutes off their time? Did you find a forced cage combo they missed? These conversations make the daily format irresistible.

Unlike classic Sudoku where you scan for given digits, Killer Sudoku forces you to think about digit combinations from the very first move. A 2-cell cage summing to 17? That's only {8,9}. A 3-cell cage summing to 6? Only {1,2,3}. This arithmetic reasoning combined with standard Sudoku elimination creates a uniquely rewarding puzzle experience.

📋 Daily Killer Sudoku Rules

If you're new to Killer Sudoku, here are the three rule sets you need to know:

1. Standard Sudoku rules — Every row, column, and 3×3 box must contain the digits 1–9 exactly once.
2. Cage sum rule — The digits inside each coloured cage must add up to the small number shown in the cage's corner.
3. No-repeat rule — No digit may appear more than once within the same cage.

Because the grid starts completely empty, all information comes from the cage sums combined with standard row/column/box constraints. Every daily puzzle has exactly one solution reachable through pure logic — no guessing required.

⭐ Weekly Difficulty Progression

Like our daily classic Sudoku, the killer variant follows a weekly difficulty curve:

• Monday & Tuesday — Easy — Mostly 1–2 cell cages. Many sums have only one possible combination, giving you quick entry points. Perfect for learning Killer Sudoku.
• Wednesday & Thursday — Medium — Cages of 2–3 cells. You'll need combination analysis plus basic elimination. The sweet spot for daily solvers.
• Friday & Saturday — Hard — Cages span 2–4 cells. Requires the Rule of 45, cross-cage elimination, and innies/outies analysis.
• Sunday — Expert — Cages of 2–5 cells. Demands mastery of digit combinations, cage-line interaction, and multi-step deduction chains.

🧠 Key Strategies for Killer Sudoku

To conquer the daily killer, keep these techniques in your toolkit:

• Cage combination analysis — List all possible digit sets for each cage. A 3-cell cage summing to 24 can only be {7,8,9}. Fewer possibilities means faster solving.
• The Rule of 45 — Each row, column, and box sums to 45. If all but one cage within a region are known, subtract to find the remaining value instantly.
• Innies and outies — When a cage partially overlaps a box boundary, you can calculate the innie (cell inside the box) or outie (cell outside) value using the Rule of 45.
• Cross-cage elimination — If two cages in the same row share digit possibilities, eliminate those digits from other cells in the row.
• Naked pairs in cages — When two cells in a cage (and the same row/box) have only two candidates between them, those digits are locked — eliminate them from peers.

📊 Streaks and Sharing

Your streak counts consecutive days you've completed the daily killer sudoku. Solve today's puzzle and your streak grows by one. Miss a day and it resets — but your best streak is permanently recorded. Hit the Share button after solving to copy a spoiler-free results card with your time, mistakes, and streak. Perfect for group chats and puzzle communities.

📅 The Puzzle Archive

Missed a day? Use the calendar below the puzzle to select any past date and replay that day's killer sudoku. Archive puzzles are generated from the same seed, so you get the exact cage layout everyone else solved. Archive solves don't affect your current streak, but they're a great way to practise specific difficulty levels.

🆚 Daily Killer Sudoku vs. Daily Classic Sudoku

Can't decide which daily to play? Here's how they compare:

• Starting point: Classic gives you pre-filled digits; Killer starts completely empty with cage sums.
• Skills needed: Classic uses pure elimination; Killer adds mental arithmetic and combination analysis.
• Difficulty: Killer is generally harder because you juggle two constraint systems simultaneously.
• Solving time: Expect Killer puzzles to take 1.5–3× longer than classic Sudoku at the same difficulty level.

Many players enjoy both — Daily Classic as a quick warm-up and Daily Killer as the main challenge. You can also try our other daily variants: Daily X-Sudoku, Daily Jigsaw, or Daily Sandwich.

🖨️ Want Unlimited or Printable Killer Sudoku?

If one puzzle per day isn't enough, generate unlimited killer sudoku puzzles on our Killer Sudoku page with four difficulty levels. Prefer paper? Download free cage-sum puzzle sheets from our Printable Sudoku section — each PDF includes multiple grids with solutions, perfect for commutes or screen-free solving.