Windows: W1

This is the first puzzle of this type which I created for practice of Indian Puzzle Team participating in World Puzzle Championship 2009. I have created some more puzzles of this type, which I will be posting here later.

This Puzzle type appeared in the following championships
"18th World Puzzle Championship, Antalya (Turkey)"

Windows Instructions

Blacken exactly two cells in each outlined 2x2 window to form one connected set of black cells which does not touch itself, not even diagonally. There cannot be a 2x2 square of four cells with the same colour (black or white) anywhere in the grid.
Logic Puzzles: Windows

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