The player learns the D'ni numerals in Riven by playing the game in the school where the prisoner is moved a certain number of clicks toward the whale-like creature depending on the number indicated on the spinning dial.
The player learns the D'ni numerals in Riven by playing with a mechanical game in a schoolhouse. In the game, a prisoner is moved a certain number of clicks towards a whale-like creature depending on the number indicated on a spinning dial.