The Internazionali Tennis Val Gardena Südtirol "(also known as the Sparkassen ATP Challenger on the ATP Challenger Tour)" is a tennis tournament held in Ortisei, Italy since 2000. The event is part of the ATP Challenger Tour and the ITF Women's Circuit and is played on indoor hard courts. The event was previously a $100,000+H ITF Women's Circuit category from 2008 to 2009.
The Internazionali Tennis Val Gardena Südtirol is played on a single type of surface
The context says "The event is part of the ATP Challenger Tour and the ITF Women's Circuit and is played on indoor hard courts" - so the event is only played on indoor hard courts - ie a single type of surface, so my statement is definitely correct. It may be difficult for the system as it does not understand the concept of indoor hard court being a type of tennis surface