ON EDGE: Brown & Green (part A)

Normal 6x6 sudoku rules apply.

Each spot along a coloured edgeline has a value, found by performing a calculation using the two digits it sits between:

SPOT RULES:

• Sum (+) spots: The value of a spot with a plus sign equals the sum of the two digits it sits between.
• Difference (-) spots: The value of a spot with a minus sign equals the larger digit minus the smaller digit.
• Product (x) spots: The value of a spot with a multiplication sign equals the product of the two digits.
• Ratio ( / ) spots: The value of a spot with a forward slash equals the larger digit divided by the smaller digit. (The value will always be an exact integer.)

LINE TYPES:

• Brown lines are 'constant edgelines'. Spot values along a brown line are all the same. This constant value must be determined for each brown line.
• The grey line is an 'edge thermo'. Spot values along an edge thermo strictly increase as you move away from the end with the bulb (the large spot.)