The schloss is also famous for its jeux d'eau ("watergames") in the grounds, which are a popular tourist attraction in the summer months. These games were conceived by Markus Sittikus, a man with a keen sense of humour, as a series of practical jokes to be performed on guests. Notable features include stone seats around a stone dining table through which a water conduit sprays water into the seat of the guests when the mechanism is activated. Other features are a mechanical, water-operated and music-playing theatre built in 1750 showing various professions at work, a grotto and a crown being pushed up and down by a jet of water, symbolising the rise and fall of power. At all of these games there is always a spot which is never wet: that where the Archbishop stood or sat, to which there is no water conduit and which is today occupied by the tour guide.

Hellbrunn stands in a large park with a neighboring zoo, a stone theater and a small building known as the Monatschlossl, or the "little month-palace",as it was built during the period of one month after a visitor commented to Sittikus that a building on the hill would improve the view from one of the schloss' windows. The archbishop took heed of his advice, and when the visitor returned a month later the Monatschlossl was built. It now houses the ethnographical section of the Carolina Augusteum Museum of Salzburg.