🌡️ Thermometer Sudoku

📖 How to play Thermometer Sudoku

1. The sudoku rules apply: 1 through 9 with no repeats in each row, column, and 3x3 box.
2. Each thermometer starts at a bulb (the circle) and follows its line. Numbers must strictly increase from the bulb to the tip: each square is greater than the one before it.
3. Click an empty square and choose a number. Each puzzle has a unique solution.

💡 Tip: the bulb usually holds a low number and the tip a high one. A 4-square thermometer can never start above 6, nor end below 4.