Marbles
Marbles is a class of children's games played with glass, clay, or agate balls usually about half an inch (1cm) across, but they can range from less than 1/4 inch to over 3". Some art glass marbles for display purposes are over 12" wide. more...
Marbles are also often collected, both for nostalgia and for their aesthetic appeal.
Gameplay
One version of the game involves drawing a circle in sand, and players will take turns knocking other players' marbles out of the circle with their own. This game is called ringer. Other versions involve shooting marbles at target marbles or into holes in the ground. A larger-scale game of marbles might involve taking turns trying to hit an opponent's marble to win. A useful strategy is to throw a marble so that it lands in a protected or difficult location should it miss the target. As with many children's games, new rules are devised all the time, and each group is likely to have its own version, often customised to the environment.
One such specialized game is called gaipar, popular in Bengal. Each player contributes four marbles, which are positioned on the edge of a rectangle. One special marble (the gai) is placed in the center. Players take turns to hit the marbles on the rectangle with a bigger marble (often called a boulder or matris). The marbles hit by the matris must be propelled out of the rectangle. If they are hit but remain within the rectangle, the player plays one more marble as a forfeit which is placed within the rectangle. The aim of the game is to hit the central gai and take it out of the rectangle. This is not easy when there are marbles on the periphery. If a player can take out the gai, he wins all the marbles. However, other players then get a chance to hit the gai-taker's boulder and, if successful, all the marbles change ownership.
Read more at Wikipedia.org