Fill every row, column and box with 1–9. No guessing required.
EASY
00:00
Click a cell, then a number (or type 1–9). Backspace erases. Toggle pencil for candidate notes.
Model
Endpoint
Checking for a local model…
The model's reasoning streams here when you ask for a hint. The cell and digit always come from the built-in logic solver, so the model can never put a wrong number on the board — it only narrates the deduction the solver already proved.
Hints, check & solve are pure logic and work without any model. Connecting a local model only adds the
plain-English detective narration. New here? connect a model ▸