🎯 Killer Sudoku — Play in Your Browser
Fill the 9x9 grid using classic Sudoku rules plus colorful cage sums. Each cage shows the total its cells must add up to, and digits cannot repeat inside any cage.
How to play Killer Sudoku
- Place digits 1-9 so every row, column, and 3x3 box contains each number exactly once.
- Cages are shown as pastel regions. Numbers inside a cage must add up to the sum displayed in its corner.
- Digits cannot repeat inside a cage—even if they are in different rows or columns.
- Use the Check board button to validate filled cells without revealing the full solution.
- Tap or click a cell to select it, then use the keypad or your keyboard to enter numbers. Use Erase to clear.
Cages totaling 3, 4, 6, or 7 have very limited combinations. Fill those first.
When a cage shares cells with a nearly complete row/column, lock digits using both rules.
A repeated digit inside a cage will be blocked instantly by the validator—use it to guide you.
The hint button fills a correct digit at random to keep you moving without solving everything.
Killer Sudoku Strategy Guide
Killer Sudoku blends the familiar 9×9 grid with cage sums that reward careful planning. On SudokuFun, you can play a fresh Killer Sudoku puzzle in your browser, then cross-train with the Classic Sudoku guide or the Daily Challenge to reinforce basic patterns. If you want a calmer warm-up before tackling cages, start with Easy Sudoku or Medium Sudoku and work up to tougher layouts.
Killer puzzles reward candidate management. Mark combinations for low-sum cages like 6 or 7, then use standard Sudoku techniques to eliminate conflicts in rows and columns. Many players mix in a timed drill on the Hard Sudoku page to practice scanning quickly. Need a structured study plan? The Sudoku Tips page breaks down techniques that apply equally well to classic and killer grids.
When you feel stuck, look for cages that already intersect with nearly complete rows or columns. Those overlaps often reveal forced placements. If you want another perspective, compare the same solving sequence on the Classic Sudoku board to see how the cage sums change your decisions.
How Killer Sudoku Differs from Classic
The biggest difference is the additional constraint: the numbers inside each cage must add to the displayed total. That means every placement has a numerical target as well as the usual row, column, and box rules. Use cage totals to rule out impossible digits, then confirm your logic with the usual scanning patterns. You can compare styles by alternating between Killer Sudoku and the Classic Sudoku board in short sessions.
Build Your Next Challenge
Once you finish a killer grid, try a lighter daily game for recovery or move into competition mode with the Sudoku Tournaments page. The Sudoku Tournament Online overview explains scoring and fair play, and the Sudoku Daily Challenge Today page keeps you aligned with daily goals. Mixing formats keeps your solving toolkit broad and your progress steady.