Normal sudoku rules apply, and digits increase along thermometers from the bulb to the end(s). The black dot marks a pair of neighbouring cells with a ratio of 2:1 - other such pairs may be unmarked.
Normal sudoku rules apply, and digits increase along thermometers from the bulb to the end(s). The black dot marks a pair of neighbouring cells with a ratio of 2:1 - other such pairs may be unmarked.