On a dark oak board, this one-player game is won by moving 21 marbles in grooves until only one is left on the board. It includes a marble bag and instructions.

— Of the many products made by Square Root Games that Games of Berkeley stocks, supervisor Gabriel Dominique said this game sells best.
— Mark Henderson, sales associate with Fun & Games in Milpitas, Calif., said the Square Root products sell well in his store.
— This classic game has been around for centuries, suggesting it will continue to appeal to customers for years to come.