Games played with marbles.
"A marble is a small spherical toy usually made from glass, clay, steel, plastic or agate. These balls vary in size. Most commonly, they are about 1/2 inch to 1 inch (1.3 to 2.6 cm) in diameter, but they may range from less than 1/30 inch (0.111 cm) to over 3 inches (7.75 cm), while some art glass marbles for display purposes are over 12 inches (30 cm) wide. ..." (Wikipedia, August 2012)