Thermo Sudoku
Enter the world of exotic variants with increasing numbers.
The Thermo Rule
In addition to normal Sudoku rules, Thermo Sudoku introduces thermometer shapes to the grid.
The Rule: Digits must strictly increase in value as they move from the bulb (the circle) to the end of the thermometer.
Why it's amazing
Because the numbers must strictly increase, long thermometers severely restrict what numbers can go where! For example, a thermometer that is 5 cells long cannot have a 5 in the bulb, because you'd run out of numbers before reaching the tip (5 -> 6 -> 7 -> 8 -> 9 is the max!).
💡 Easy Practice: We have pre-filled almost the entire board for you! To solve this challenge, simply look at the empty cells along the thermometers and place the only remaining numbers that satisfy the strictly increasing rule.