Normal sudoku rules apply. Constraints: A) Digits on an arrow sum to the digit in that arrow’s circle; B) Neighbouring digits on a green German Whisper line (GW) must have a difference of at least 5; C) Digits on a purple Renban line (RB) form a non-repeating set of consecutive digits; D) Grey Ten-lines (T) must be divided into non-overlapping segments each of which sums to 10; E) Digits separated by a black dot are in a 1:2 ratio (ie one is double the other). Each constraint type may contain no repeated digits anywhere in the puzzle. Eg. If one renban line contains a 5, then no other renban line may contain a 5. Digits cannot repeat on the positive (SW-NE) diagonal. Digits cannot repeat on the negative (NW-SE) diagonal. Digits cannot repeat in cells with blue squares. Cells with an opaque grey circle contain odd digits. Additionally the grid is partially covered in fog. Placing a correct digit may clear fog somewhere in the grid.