Normal sudoku rules apply. Digits in cages cannot repeat and must sum to the small clue given in the upper left corner of the cage. Cells separated by a white dot contain consecutive digits. Not all dots are necessarily given. Draw a one-cell-wide loop of orthogonally connected cells. The loop may not touch itself, not even diagonally. The loop must occupy all cells of all given cages. Adjacent digits on the loop must alternate polarity (low [1234] vs high [6789]).