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, and hidden fountains that surprise and spray guests while they take part on the tour. Other features are a mechanical, water-operated and music-playing theatre built in 1750 including some 200 automata 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.
The castle is so popular and famous that it was the subject of a collectors coin: the Austrian 10 euro Castle of Hellbrunn Coin, minted on April 21, 2004. The obverse depicts the main access to the castle from its forecourt. In the background there are mountains of Salzburg on the northern rim of the alpine chain.