Logic Masters Deutschland e.V.

The numbers on the outside of the grid indicates the sum of digits on the indicated diagonal.

Gray Squares indicate even digits.

Gray Circles indicate odd digits.

Either the gray squares are true, or the gray circles are true, the other of which should be treated as an empty cell except:

Construct a line through the puzzle, such that the line passes through each of the clues that is not true, does not enter the cell of a clue that is true, does not cross itself, and moves only orthogonally. The line starts and ends at the unshaded circles.

Digits on the line have an equal sum N within each box it passes through. If a line passes through the same box more than once, each individual segment of such a line within that box sums to N separately. N is equal to the number of turns the line makes, in other words how many "corners" the line ends up with (e.g. if the line starts in the bottom left on r8c2, travels north to r1c2, and then east to r1c6 where it ends, the line would have made one turn and N would be one).

F-Puzzles link: Click here

CTC link: Click here