Normal-ish Sudoku rules apply ie place one of the digits 0-8 in every empty cell so that there are no repeated digits in any row, column or 3x3 box. Every 3-cell sequence on a teal line contains one digit from {0,3,6}, one from {1,4,7} and one from {2,5,8}. Digits an equal distance to the hat on the lavender line sum to the hatted digit. Digits joined by eyes are in a 1:2 ratio (ie one digit will be double the other). Digits joined by a small white dot differ by 1. Digits joined by an X sum to 10.