Normal sudoku rules apply. Digits separated by a small white dot must be consecutive. Draw a closed loop into the grid that travels orthogonally between cells and doesn't visit the same cell more than once. The loop must not visit any big circles. The loop acts as an entropic line, i.e. three adjacent digits along the loop must contain one digit from {1,2,3}, one digit from {4,5,6} and one digit from {7,8,9}. The number of loop turns is different in each 3x3 box. A digit in a big circle indicates the number of times the loop turns in that box.