This puzzle appears to be a Nikoli original.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid. Some of the cells contain numbers.
The goal is to mark of rectangular regions to satisfy the clues.
The solved grid must satisfy the following conditions:
Each region contains exactly one numbered clue.
The numbered clues represent the area (that is, width times length) of the region containing it.
Block-a-Pix (Conceptis) produces a picture.
In Kapetto, some squares are not included in regions.
Divide by Box; Divide by Squares; Kapetto; Number Area; Rectangles; Shikaku ni kire; Sikaku; Zahlenareale