Problem to place eight queens on a empty chessboard in such a way that no queen attacks any other queen.
Have you ever tried golf at night - with sunglasses on ? Click somewhere in the green to drop the ball. It will bounce around until it gets to the hole - the location of which initially is unfortunately unknown to you. The smaller the number of bounces the better, of course.
One of those frustrating toys. You have a picture divided into 8 pieces of plastic. Sliding them about to make get the picture back together.