Normal sudoku rules apply. Digits on the marked diagonal must not repeat. Digits separated by a king’s move must not repeat. The grid contains a number of bidirectional thermometers (ie: digits must increase from the bulb end, but the bulb end is not known). Each thermometer contains either all odd or all even digits. The blue and red thermometers are special: Firstly, the position of their bulbs are known and are coloured. Secondly, the blue bulb is colder than the red bulb (ie: it contains a lower digit). Thirdly, the blue thermometer is colder than the red thermometer (ie: the sum of its digits is lower).