Goal:Arrange the tiles of Fig.1 as shown on the right figure so that the colors of each side match the ones on adjacent tiles. The tiles can be rotated.

Help:Click here to see the tiles oriented in such a way that no rotations are needed to solve the puzzle.

Goal: Arrange the pieces in a 8x8 board so that no two circles are in the same row, column or diagonal. The pieces can be rotated. As an example, the figure on the right shows incorrect positions, since the circles are in the same diagonal.