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Mirror, Mirror Puzzle - Solution
The Puzzle:
If you continue shading the squares so that the two dotted lines become lines of symmetry (mirror lines) of the completed diagram, how many squares will be left unshaded?
Our Solution:
If you continue shading the squares so that the two lines become mirror lines, we get this:
(Note: I have shaded the new squares differently just so you can see where they go.)
The number of squares left is then 9.
Puzzle Author: Stephen Froggatt