Moons (game)
From Halopedia, the Halo wiki
A variant of pool called Moons exists in the 2500's. Its revised rules include reversing the laws of movement. A ball, when struck hard will move slow, whereas if it is struck softly, it will move fast.[1]
Thin Kinkle is a fan of the game, and often hangs out with his gang at a moons parlor called Sharfie's.