Thermo Sudoku

Use ordinary Sudoku units. Digits increase strictly along each thermometer, starting at the round bulb.

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

Digits strictly increase from the filled round bulb along the drawn path. Bends do not reset the order. On a four-cell thermometer the bulb is at most 6 and the tip is at least 4.

A placed 5 at the second cell of a four-cell path forces later cells above 5 and 6. Compare those bounds with the ordinary units; a removed candidate can make another cell a single.

Two paths can influence the same row or box without touching. There is no extra anti-knight rule in this game. The direction and the current candidate sequences are what justify eliminations.

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.