Underground/en

Instructions

   

Draw a map of an underground of a city (with horizontally and vertically lines from center to center of the fields). Note:

• At the center of a field, the lines may turn or branch.
• The whole map is connected.
• There are no dead ends.
• The underground cannot leave the grid.
• The numbers at the borders give the corresponding numbers in that row or column. The pieces may be rotated.
• Fields may stay empty.