From WPC unofficial wiki


Divide the grid into rectangles along the grid lines such that each cell is in exactly one rectangle and each rectangle contains exactly one given number. The number must equal the area of the rectangle (in cells).

(Rules from PGP IB, example from WPC 2019 IB)

History of the puzzle[edit]

First appeared on Nikoli volume 27 (1989). Invented by Yoshinao Anpuku. The original title 四角に切れ means "divide into rectangles."


Double Shikaku[edit]

First appeared on WPC 2018/Round 10, "Double Trouble". The puzzle was written by Jiří Hrdina (Czech Rep.).

In the given grid, one of the paired (adjacent) clues belong to one Shikaku puzzle and the other half belong to the other. Reconstruct two puzzles and solve them.

(Example from WPC 2018 IB)

Appearances in the past WPCs[edit]