Play free →
Play free →
A clean board, thousands of hand-tuned puzzles, and that satisfying click when the last number drops into place.
We generate each board and verify it before it ever reaches you. No guessing, no branching, no dead ends — if you're stuck, there's always a logical next move waiting to be found.
Easy is genuinely gentle — great for a coffee break. Expert leaves only a handful of clues and will absolutely make you think. The jump between levels is deliberate, not random.
Stuck? Instead of just dumping the answer, the game points out the technique — a naked single here, a hidden single there — so you actually get better instead of just getting unstuck.
Clean interface, instant loading, nothing standing between you and the puzzle. You open it, you solve, you close it. That's the whole deal.
Tap a cell, drop in a number, watch matching digits light up across the board. Pencil in notes when you're working through possibilities. Undo as much as you like. It's the Sudoku you grew up with — just smoother.
Same grid, extra brainpower. The board is split into dotted "cages," and the numbers inside each cage have to add up to its total — without repeating. It rewards arithmetic and pattern-spotting in equal measure, and it's wildly addictive once it clicks.
You and your opponent get the exact same Sudoku puzzle. First to fill it in wins. No prep, no waiting — tap Quick Match and you're in a live game in seconds. Web players and Android app players are matched together.
"Finally a Sudoku app that doesn't shove an ad in my face every time I finish a puzzle. The Expert level is no joke — I've spent entire train rides on a single board."
"I started on Easy a few months ago and I'm now clearing Hard puzzles without hints. The way it explains the technique when you're stuck genuinely taught me to play better."
"Killer Sudoku is my new obsession. It loads instantly in the browser, works on my ancient phone, and I never had to make an account. Exactly what I wanted."
You can play right now in your browser — nothing to install, no sign-up. Or get the Android app on Google Play, with offline puzzles and progress that follows you everywhere.
Add to your Home Screen for the full app experience — plays offline, launches instantly.