GnollHack is fully voice-acted by real voice actors. Voiceover lines are provided for the NetHack's entire vast text repertoire, which includes:
- Intro text
- Shopkeepers
- Wizard of Yendor
- Angels and demons: Maledictions and insults
- Quests
- NPCs
- Player Characters
There are 97 voice actors in 110 roles. There are over 5000 voiceover lines in the game.