Slitherlink

Chart the Cartographer’s Ward

Draw one closed loop along the brass pins. Each numbered seal says exactly how many of its four sides belong to the loop; the ward cannot branch, cross, or close into a second smaller loop.

All 120 maps are open, grow from 4×4 introductions to 9×9 master charts, and are independently proved to have one deduction-solvable answer during every build. Each map keeps a named public fastest time and top ten.