From WPC unofficial wiki


Draw a horizontal or vertical line segment into each empty cell. The numbers indicate the total length of all horizontal or vertical lines connected to the respective cells.

(Rules from WPC 2019 IB, example from janko.at)

History of the puzzle[edit]

Invented by Naoki Inaba (Japan) in 2010. Originally named ウォールズ(Woruzu), transcription in Japanese of the word "Walls".

First set of puzzles created by Naoki can be seen here.

Appearances in the past WPC[edit]