Normal sudoku rules apply. Draw a one-cell wide loop that moves orthogonally through the center of cells and does not branch, intersect with itself or touch itself (neither orthogonally nor diagonally). The loop has to visit each box at least once. For each box, the maximum number of cells belonging to the loop is k, where k is the box number. Within each box, the box number has to be part of the loop. Boxes are numbered in normal reading order. Two orthogonally adjacent cells are only allowed to contain digits that sum to 7 or 10 if both cells are not part of the loop. The 24 cells that are enclosed by the loop have to contain two magic squares. A magic square is a 3x3 region containing the digits from 1 to 9 once each, where each row, column and diagonal must sum to the same value.