Jigsaw Sudoku

Each row, column and outlined nine-cell region contains 1–9 once. The irregular regions replace ordinary boxes.

1. Select an empty cell, then choose a digit or switch Notes on.
2. Ask for a gentle hint: attention first, proof next, then the conclusion only when you request it.
3. Undo uncertain moves or pause. Every puzzle is open; daily selections use a separate save.

Select a cell · 1–9 fill · N notes · arrows move · Delete erase · Ctrl/Cmd Z undo

A thick outline encloses one nine-cell region, even when the region bends across where a familiar box would have ended. Row and column rules still apply. Ordinary 3 × 3 boxes do not.

Select a cell to see its related cells. Follow all nine region cells, then look for a digit with only one candidate position. Do not stop at a straight-looking edge.

If all candidates for one digit in a region lie on a single row, the digit is locked into that row segment. It can be removed from the other cells in that row.

Game progress belongs to this browser and this address. Use the game’s own save tools where available. Changing addresses or clearing browser data does not transfer your save.