Killer Sudoku: Logic Puzzles

Daily killer sudoku with a streak you build one puzzle at a time. Logic puzzles, cage sums and brain games for everyone, fully offline.

Killer sudoku is a sudoku variant and a number puzzle where every cage shows a target sum, and the digits inside must add up to it without repeating. Sometimes called cage sudoku or sum sudoku, it keeps the classic sudoku rules — every row, column and 3x3 box holds 1 to 9 exactly once — and adds the cage layer on top. The result is a logic puzzle that rewards deduction over guessing, the same satisfaction as classic sudoku with a sharper edge.

Solve one killer sudoku a day to build your daily streak. The longer the streak, the harder it is to walk away. Miss a day and a streak freeze covers you, earned automatically the moment you reach day three. The daily challenge resets at midnight and gives you a fresh killer sudoku to keep the chain alive. The streak turns the daily puzzle into a habit, not just a game.

New to killer sudoku? It is the right logic puzzle for someone who already enjoys classic sudoku. Start on Easy: smaller cages, friendlier sums, and the same deduction skills you already have. As you play, you will get the feel for cage combinations — which digits sum to a given target, the no-repeat rule inside a cage, and how cages interact with rows and columns. Killer sudoku for beginners is only a few sessions away from killer sudoku for experienced players.

Already a killer sudoku player? The Hard difficulty gives you tight cages, sparse clues, and the kind of logic puzzle that takes half an hour and rewards every minute of it. The grid supports advanced solving: pencil marks update themselves or stay manual, undo and redo work without limit, and conflict highlights are optional so you can solve the way you prefer. No hand-holding unless you ask for it.

Built to stay out of your way: pencil marks, undo and redo, auto-save between sessions, optional error checking, optional matching-number highlight, optional conflict warnings. Choose how cages render — borders, colours, or both. Light mode, dark mode, or follow the system. Solving stats track your times across every difficulty as a daily brain training log. Fully offline play, no account, no internet required. Open the app, place a number, start the chain.

Inside the app:

- Daily killer sudoku challenge with streak tracking
- Logic puzzle difficulty: Easy, Medium and Hard
- Streak freeze earned at day three to cover a missed day
- Brain training through logical deduction, not memorisation
- Cage sudoku with full pencil mark support
- Number puzzle stats across every difficulty level
- Sum sudoku rules: no repeats inside any cage
- Killer sudoku for beginners and experienced players
- Auto-save so your puzzle waits for you
- Light and dark themes, plus a system option
- Customisable cage display: borders, colours, or both
- Fully offline puzzle game, no account needed

If you like classic sudoku, kakuro, mathdoku, calcudoku, brain games or any kind of number puzzle, killer sudoku is the next variant to try. It sits at the intersection of logic puzzle and arithmetic puzzle, which is exactly why it became the daily puzzle of choice for solvers who want one fresh challenge every morning.

This killer sudoku is supported by ads. A one-time purchase or a monthly subscription removes them. Either way the puzzles, the streak, and every difficulty level are yours from day one — there is no daily play limit and no premium-only content.

Your next killer sudoku is waiting. Open the app, solve today's puzzle, start the streak.

Questions or feedback? Email us at dark.disc6864@fastmail.com