This is an ingenious set of hands-on challenges that seem so incredibly easy at first! Twelve giant coloured pieces, each consisting of two overlapping rectangles that have been locked together. Recreating the image in each of the challenges looks as though it should be straightforward enough, until you realise that the pieces don't necessarily fit together in the way you need them to! Extremely clever & with a huge 163 challenges ranging from very easy to incredibly difficult.