Draw a single loop through all circles. Black circles turn 90 degrees. White circles go straight. Numbers show segment lengths.
Goal: Draw a single closed loop that does not cross itself, passing through ALL circles.
Circle Rules:
• Black circles (●) are turns — the loop must change direction here.
• White circles (○) are straight — the loop passes through without turning.
• The number on each circle tells you the length of the straight line segment going from that circle in the direction of the loop (counting cells including the circle itself).
Controls:
• Click an edge between two cell centers to draw/erase it.
• Draw mode: click adds edges. Erase mode: click removes.
• Keys: H hint, R restart, Enter check, Esc menu.