Normal Sudoku rules apply. Also: Digits along an arrow in the grid must sum to the digit in its circle.; Along thermometers, digits must increase from the bulb end; The green line is a palindrome, it reads the same from both directions. Each different digit must appear at least once on the palindrome; The black dot means that the ratio of the two connected cells is 2; The white dot means that the difference of the two connected cells is 1; In cages, digits must sum to the small clue given in the top-left of the cage; There are no negative constraints.