A personal coach for the Sudoku in front of you

Stop getting stuck on the same Sudoku pattern.

Bring your grid. doku.su explains the next logical step, remembers what tripped you up, and gives you short practice until it sticks.

Use my Sudoku → Return to my puzzles

✓ Start free. No account. ✓ Saved mistakes become short practice

“Let’s make this pattern stick.”

Try the coach

Find the next move without guessing.

Start with where to look. Reveal the useful evidence, name the pattern, and see why the move is safe only when you need the complete proof.

Try this on a real puzzle → This explanation comes from the same deterministic solver used in every coached puzzle.

Use logic firstEvery hint starts with a valid deduction.

Learn by solvingShort lessons lead to guided practice.

Set your own pacePractice without pressure.

Checkable by design

Every coaching message is bounded by facts rebuilt from the current grid.

Verified puzzle logicPuzzles have one solution, and every recommended move comes from the deterministic engine.
Start without an accountPlay and learn locally first. Create an account only when you want cross-device sync.
Learning survives a lost connectionAvailable lessons and local puzzles remain usable offline after they have been loaded.

Learn Sudoku one clear step at a time

doku.su rebuilds every clue from your current grid. It shows what to inspect, lets you reason, and reveals more only when you ask.