Geradeweg ("Straight Loop") is a logic puzzle. A rectangular or square grid contains circles with numbers in some cells. The task is to draw a single closed non-intersecting loop that passes through all circles. The number indicates the length of the straight segment passed through the circle. If the loop turns in a number cell, both straight segments must have the same length as the number indicates.
Cross+A can solve puzzles from 3 x 3 to 30 x 30.