SudokuVariants

Thermo Sudoku Help

Thermo or Thermometer is a variant of Sudoku which overlays thermometers on the grid. Thermometer consists of bulb cell and thermo line cells. Value on thermometer must increase from circle bulb end to the other end. Values on thermometer cannot repeat.

Thermo Sudoku Image

Thermo Sudoku Solving Strategies

If thermometer is 9 cells long it must contain all digits from 1 to 9.

Thermo Sudoku image

If it's 8 cells long each cell has 2 candidates.

Thermo Sudoku image

It if's 7 cells long, each cell has 3 candidates.

Thermo Sudoku image

By limiting candidates in some cells we can limit candidates on all thermo cells.

If we remove 4 candidate from box 1 and 7 from box 2 we have the following candidates left:

Thermo Sudok Image

Those candidates are still not valid, if we try to put 6 in yellow cell, we will have to put 7 on thermo in box 2, and 7 is not available. That's why yellow cell must be 5, and after 5 we have 6, 8 and 9 because 7 is not available.

Thermo Sudok Image

Candidates lower than 5 must be 1, 2 and 3, since 4 is not available.

Thermo Sudok Image

Two cell Thermo constraint can be a replacement for Greater Than.

Thermo Sudok Image

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