Free Unlimited puzzles No sign-up Family friendly
Killer Sudoku hub
Read cage-and-sum strategy here, then practice on a clean 9×9 grid with notes, hints, and undo.
Our player uses classic Sudoku rules today so you can train placement logic; cage overlays are planned. Every puzzle still has one solution.
Choose your level
Get started
Explore
Did you know?
We generate fresh Sudoku-valid boards so you can rehearse the logic Killer puzzles inherit before cage overlays ship in-browser.
When you graduate to printed Killers, sums shrink candidate tuples—read our cage guides while you sharpen pencil-mark habits here.
Candidate marks remain essential for harder Killers; treat this hub as technique rehearsal.
Quick questions
Yes. No payments or sign-up—play as much as you like.
Yes. Family friendly, with no inappropriate content.
No—open the site and choose a difficulty.