Gonggi

Gonggi (공기, pronounced gong-gee) is a popular Korean children's game that is traditionally played using 5 or more small grape-sized pebbles. Nowadays, children buy colourful plastic stones instead of finding pebbles. It can be played alone or with friends. The stones are called gonggitdol (공깃돌), which means "gonggi stones." Since only a few stones and a flat surface are needed for play, the game can be played by anyone almost anywhere.