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


The objective is to shade some cells, subject to the following rules:

  1. Numbers indicate how many shaded cells are in a region.
  2. Shaded cells must form rectangles, independently of the region borders.
  3. Shaded rectangles must not touch horizontally or vertically.


A standard 10x10 chocona and its solution.

Chocona Example
Chocona Answer

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