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Heyawake

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Description

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

Rules

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

  1. Numbers indicate how many shaded cells are in a room.
  2. Shaded cells must never touch horizontally or vertically.
  3. Unshaded cells must form one, connected area.
  4. A straight line of unshaded cells can only connect two rooms, a line of white cells which connects three or more rooms is not allowed.

Example

A standard 10x10 heyawake and its solution.

Heyawake Example
Heyawake Solution












Variants

Unless otherwise indicated, standard heyawake rules apply to all variants.

Heyawaky: A straight line of unshaded cells can only cross over one border at the most, even if it would re-enter a room.

Heyawake Symmetry: Instead of clue numbers, clues indicate whether the pattern of shaded cells has 180° symmetry within a room or not.

Heyawake Twin: Shaded cells share an edge with exactly 1 other shaded cell.

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