3.7.223. Shikaku
Denotes that a constraint can be used for solving the Shikaku puzzle. Given a rectangular grid, where exactly cells contain an integer value, the problem is to tile that grid by rectangles in such a way that the surface of each rectangle is equal to the single integer it contains.
Figure 3.7.59. (A)ย An example of a Shikaku puzzle and (B)ย its corresponding unique solution
Partsย (A) andย (B) of Figureย 3.7.59 respectively show a small instance of such a puzzle and its corresponding unique solution taken from the Nikoli website https://member.nikoli.com/index.html.