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Dosun-Fuwari

Sample

Solution

Rules

  1. Place balloons (white circles) and iron balls (black circles) according to the following rules.
  2. Place one balloon and one iron ball in each of the areas surrounded by bold lines.
  3. Balloons are light and float, so they must be placed in one of the cells at the top, or in a cell right under a black cell (filled-in cell) or under other balloons.
  4. Iron balls are heavy and sink, so they must be placed in one of the cells at the bottom, or in a cell right over a black cell or over other iron balls.

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