Draw a loop into the diagram following the usual "Rundweg" (Slitherlink) rules (A digit inside a cell indicates the amount of its edges used by the loop). The numbers outside the diagram provide additional information about how many fields of this column/row are inside the loop. Each number represents one group of fields inside the loop. Each group contains linked fields equal to its number. Different groups must have at least one field outside the loop between them. Given clues are in increasing order.