The credit game involved players aligning matching symbols on a device to earn credits as a reward. These games came in various colors, such as blue, green, purple, and red.
At least five credit game machines were available in the game room of the Tahlboor space station, known as Level Seven. Approximately around 5.5 BBY, R2-D2 triumphed in the game, accumulating so many credits that the station's financial reserves were depleted.
It seems the credit game shares conceptual similarities with a slot machine.