Gobstones

Gobstones is a marbles type game, played with stones. When a player loses a point, the stone then spits a putrid liquid at the player.

Gobstones is popular among students at Hogwarts and some a part of Gobstone clubs. Most students have their own set, Harry was even debating buying a gold set in Diagon Alley. Some students may even have aspirations to join the Internaional Gobstones League.

For more information on Gobstones, see the The Official Gobstone Club Offices, on level 7 of the Ministry of Magic.