A Catholic video game studio have developed a new game based on the life of Pope St John Paul II - where he battles demon moles and NAZIS.

The game, The Adventures of Saint John Paul the Great, lets people play as the late Pope, collecting saints' medals, bibles, cakes and rosaries.

Sydney bishops Richard Umbers and Anthony Randazzo tried it out last week, with both achieving the same time and same number of points - while dodging bullets and falling boulders.