Mochikoro is a binary determination puzzle in which the cells in a grid are split into either shaded or unshaded.


The objective is to form unshaded rectangles, subject to the following rules:

  1. Unshaded cells must form rectangles, numbers giving the area of the rectangle they are contained in.
  2. Shaded rectangles must not touch horizontally or vertically, but must connect at, at least one corner to form one connected region.
  3. Numbers can't be part of the same rectangle, conversely not all final rectangles may start with a number.
  4. There must be no 2x2 area of shaded cells.


A standard 10x10 mochikoro and its solution.

Mochikoro Example
Mochikoro Solution