The objective is to place all the pieces into the grid to match the 60 black & white challenges.
Most interesting: all the pieces bend in some way.
Even more interesting: the construction of the pieces is outstanding.
I solved about 20 levels. These puzzles get very challenging. Probably too hard for kids under 12.
From A Reviewer on Amazon:
By Richard and Liz on May 25, 2014
The secret to solving the puzzles is to find where only one certain piece can go. This can change for each puzzle but for example in Puzzle 23 there is a place where there is a lone white dot encircled by all blacks. Only one of the six pieces can be used there. There may still be a couple ways to put in that piece but you can use elimination once you know the piece you are working with.