Normal sudoku rules apply. In cages, digits sum to the small clue in the top left corner of the cage. Clues outside the grid give the sum of the digits along the indicated diagonal. Cells separated by a white dot contain consecutive digits. Cells separated by a black dot contain digits in a 1:2 ratio (ie one digit is double the other). Not all possible dots are given. Grey lines are palindromes and must read the same forwards and backwards.