Rules: Draw one or more horizontal or vertical line emanating from each numbered square, crossing each blank square exactly once (lines connect only blank squares and cannot cross). Each number is the total of the following: the number squares that are connected by its lines going up and to the right, minus number of squares that are connected by its lines going down and to the left (the numbered squares themselves are not counted).
Background: This is a USPC 2012 puzzle by Michael Rios. I think this is a very brilliant idea which transformed the Eminent Domain into a cool type.
Example:
yureklis.wordpress.com 