Howrse is an online horse breeding game in which players raise horses and ponies, take care of them, train and enhance their skills and abilities

Zara, who's an Olympic medallist in the equestrian, will guide players through the opening parts of the game and help them complete the tutorials.

It's the first time a royal has been in a computer game.

Zara said: "It's great to be involved with a game that lets children and adults alike interact with horses"