Normal sudoku rules apply. If digits are separated by a white dot, they must be consecutive. Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area can be entirely shaded or unshaded. Clues outside the grid give the sum of the digits strictly between the 1 and 9 in the respective row or column. The full sandwich must be shaded if a sandwich clue is given (i.e. in the case of a sandwich clue of 6 the string of digits 1429 MUST be shaded in that row).