March 2022 Update
20 new puzzles, all 100 puzzles are out now!

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How does Thermo Sudoku work? Each sudoku grid contains thermometer shapes (often drawn to create themes) and digits on thermometers must increase as one moves further from the bulb end.
| Date observed | Region | Final price | Regular price | Discount |
|---|---|---|---|---|
| US · USD | $4.99 | $4.99 | — | |
| US · USD | $4.99 | $4.99 | — | |
| US · USD | $4.99 | $4.99 | — |
20 new puzzles, all 100 puzzles are out now!
This update comes with 20 new puzzles and the launch of Smart Hints (beta) for Thermo Sudoku!