What is "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 , 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. This same game also exists in Nepal and it is called 'gatti'.