The object of Block fill is to fill the grid with rectangles and squares. Each number must rest inside one of those rectangles and there must be exactly that number of squares inside.
I first saw these puzzles in print form from Nikoli - the Japanese puzzle book publisher in 2001. They're fun!
I've been playing the 10x10 grids. A bit small for the ipod/iphone. Perfect for the ipad. Each puzzle takes about 1 minute to solve.
Right now the app is free! Download it.
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