The premise of Manifold is deceptively simple. Fold a piece of paper into a 4x4 square so all the black squares are on the top and all the white squares are on the bottom (gray squares must be hidden).
There are 100 different puzzles ranging from easy to expert. You can try out 5 of the puzzles before you buy by printing out this PDF.
Price = p168 pence = £9.97