Sudoku

Sudoku, solved right.

Every puzzle here is generated on the spot and checked by a real backtracking solver before it ever reaches your screen — guaranteed to have exactly one solution. So if you get stuck, the puzzle is never the problem.

Sign up to play How it works
Difficulty tiers
3
Valid solutions per puzzle
Exactly 1
Moves forgotten
0
9
8
1
7
5
5
7
3
5
2
8
6
4
3
8
9
6
4
5
3
8
8
7
1
2
3
7
3
4
5
7
4
6

Built to earn your trust, one grid at a time

Nothing here is hand-waved. Every claim below is something the app actually does, not just says.

No guesswork puzzles

Every board is generated, then dug down to size while an exhaustive solver keeps checking that exactly one solution remains. A puzzle that turns ambiguous never gets dealt to you.

Fair difficulty, not vibes

Easy, Medium and Hard come from one rubric — how many clues the board starts with. No puzzle is labeled harder than it actually is.

Pick up where you left off

Every move you make is saved the moment you make it. Your dashboard always shows the boards you have in progress, ready to continue.

A full record of how you solved it

Nothing about your play gets summarized away. Every move is logged in order, so you can look back over your own path to the solution.

Play smarter, not harder

Select a cell to highlight its row and column; select a filled one to see every other cell holding that digit. A number pad keeps entry fast.

Bring your own puzzle

Type in any board and the same solver checks it live — solvable, unsolvable, or ambiguous — before you commit to playing it.

Three steps to your next puzzle

1

Sign up

Accounts are simple and fast — verify your email and you're at your dashboard.

2

Generate or design

One click hands you a brand-new puzzle, or build your own and have it verified instantly.

3

Solve with real tools

Highlighting, a number pad and a full move history stay with you from first cell to last.

Ready to sharpen up?

Your next puzzle is one click away — and it's guaranteed to be solvable.

Sign up to play