Other versions of this page
δΈζTwo rules, one physical metaphor. Every thermometer fills from its bulb (β) along the tube β a cell can be filled only if everything between it and the bulb is filled, never with gaps. The clues outside the grid say how many cells in that row or column end up filled. That's it: no numbers inside the grid at all.
Today's verified daily is live β play it now.
| Rule | What it means |
|---|---|
| Mercury | Each thermometer fills from the bulb along its tube β contiguously, possibly not at all, possibly fully. |
| Row/column counts | Each outside clue equals the number of filled cells in that row or column. |
| Interaction | Thermometers bend across rows and columns, so one fill decision feeds several counts. |
A clue equal to the number of thermometer cells in that line fills them all; a 0 empties them all. Both cascade along tubes into neighboring lines.
For every thermometer, ask: how few cells CAN it contribute to this line, how many at most? If the minimum already meets the clue, everything optional is empty β and vice versa.
Filling one cell fills everything bulb-ward on the same tube β including cells in other rows. Always propagate along the tube before reading the next clue.
450 daily 6Γ6 boards (from 2026-08-24) plus 320 free-play boards. The solver uses suffix-bound pruning to prove each published board has exactly one solution reachable by deduction β the same check as every other game on this site.
Fill thermometers with mercury starting from the bulb, continuously along the tube with no gaps. Numbers outside the grid tell how many cells are filled in each row and column.
Yes β a thermometer can be empty, partly filled, or full, as long as the filled part starts at the bulb and is contiguous. What it cannot have is a gap.
Do the extremes: any row or column whose clue equals its total thermometer cells is fully filled; any 0 line is fully empty. Both propagate along bent tubes into other lines and usually unlock the middle of the board.
More rules guides: βΆ futoshiki rules Β· β« kropki sudoku rules Β· π₯ͺ sandwich sudoku rules Β· π skyscraper puzzle rules Β· β star battle rules Β· β¦ nonogram rules Β· π’ 6x6 sudoku rules Β· π binary puzzle rules Β· 𧩠games like linkedin queens
By the team behind AGI Scorecard Β· Play Β· Archive Β· Research benchmark