Normal sudoku rules apply. The grid is covered in fog. Correctly entering digits will remove the fog in the surrounding cells. Each line has a distinct colour. Lines do not branch, cross, and only move orthoganally. All lines are renban (ie contain a set of non-repeating consecutive digits, in any order). All lines are “region sum” (ie along a line, each line segment within a different 3x3 box must sum to the same total (N). N may be different for each line.) All lines have a length of 3 or more. One line is also a thermometer and digits will increase from its bulb. (The bulb may be in the middle of the line.)