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:
- Unshaded cells must form rectangles, numbers giving the area of the rectangle they are contained in.
- Shaded rectangles must not touch horizontally or vertically, but must connect at, at least one corner to form one connected region.
- Numbers can't be part of the same rectangle, conversely not all final rectangles may start with a number.
- There must be no 2x2 area of shaded cells.
A standard 10x10 mochikoro and its solution.