It is a popular activity available on playgrounds. As a child on Eridanus II, John-117 was not allowed by the other kids to play it, because he always won. A table game named "Gravity Ball," played in bars such as Eddie's In The Rock in The Rubble, may be a smaller-scale variant of the game. Gravball lends itself easily to military training exercise and many UNSC drill instructors have worked combat elements into the game and use it in training regimes. In 2558, a variant of the game was incorporated into War Games simulation aboard the UNSC Infinity.