### Shingoki

**Shingoki** (from Japanese, literally *"traffic lights"*) is a rectangular or square grid with circles in some cells. The goal is to draw a single continuous non-intersecting loop that passes through all circles. Black circles must be turned upon, white circles must be traveled straight through. In a cell with a gray circle the loop may turn or not. If a circle contains a number, this number indicates the total length of the straight lines going out of the circle.

**Cross+A** can solve puzzles from **3 x 3** to **30 x 30**.