US Patent 8403328 Game board and accompanying game pieces

Game board having a wavy relief structure formed of a series of rises and dips extending at regular distances from one another in at least two different directions and whereby one or several game pieces are further formed as sliding pieces with one block or with several blocks which are connected to one another and whereby the lower contact surface of every block has a sloping shape which is predominantly complementary to the shape of the dips of the game board.