Walls

Rules

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

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

• WPC 2019/Round 2 by Christian Halberstadt
• WPC 2017/Round 7 by Prasanna Seshadri
• WPC 2017/Round 12 by Amit Sowani
• WPC 2016/Round 5 by Matúš Demiger
• WPC 2016/Age Division Playoffs by Matúš Demiger