Divide the grid into nine regions, each consisting of nine orthogonally-connected cells. Each row, column and region must contain the digits 1 to 9 once each. Each line must pass through at least two regions. A “line segment” consists of the digits along the line within a region from the point that line starts in that region to when it next leaves it (or ends). The sum of digits along each line segment along a line must be the same. Different lines can have different line segment totals. Digits in a circle indicate the number of cells that are part of a line in that cell's region.