Printable Thermo Sudoku

Three Easy and three Hard puzzles. Numbers must strictly increase along each thermometer, starting from the round bulb. Solutions are on the last page.

Play online

Puzzle 1 · Easy

Puzzle 2 · Easy

Puzzle 3 · Easy

Puzzle 4 · Hard

Puzzle 5 · Hard

Puzzle 6 · Hard

Solutions

Solution 1

Solution 2

Solution 3

Solution 4

Solution 5

Solution 6

Rules: Fill the grid so every row, column and 3×3 box holds 1 to 9. Along each thermometer, numbers must get bigger, starting at the bulb. Numbers on a thermometer can’t repeat. Learn more