This is a very simple but challenging game. It consists of a hard plastic board with a zigzag path and a leg that can be placed in the back in different positions. The board is shaped in such a way that it can be rocked from side to side. A steel marble is placed at the bottom of the path and by rocking the board the marble can be maneuvered up to the top. The leg in the back of the board makes it angle up at the top. Each position has a corresponding score, the higher the score the steeper the angle. Players take turns and score points for each successful trip up the board. If a player loses control and allows the marble to come all the way back down his turn is over. The player with the highest score after a pre-determined number of turns wins. - BoardGameGeek