# NVIDIA — nemotron-halloween

- Company: NVIDIA (nvidia.com)
- Announced: 2026-10-30T17:57:24+00:00
- Category: not stated
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://huggingface.co/blog/nvidia/nemotron-halloween
- Record: https://forck.live/items/29961-nemotron-halloween
- Models affected: Nemotron 3.5 Bolt E4B 4GB, Nemotron 3 Nano Omni, Qwen3 30B-A3B, Qwen 3.6 35B-A3B

An NVIDIA employee built MonsterHouse, a Halloween garage-door installation that talks to trick-or-treaters, using the NVIDIA Nemotron Voice Agent with Nemotron Speech, Nemotron 3.5 Bolt E4B 4GB, Magpie TTS Zeroshot and Audio2Face-3D on one workstation. The house listens through Nemotron Speech ASR, writes replies with Bolt E4B, voices them with Magpie TTS Zeroshot from a short reference sample, and animates a wooden mouth in Unreal Engine 5 through Audio2Face-3D. A LoRA adapter trained on more than 5000 multi-turn conversations supplies the grumpy pirate-ship personality, and Nemotron 3 Nano Omni describes costumes while YOLO and ByteTrack count visitors. The author says Bolt E4B was tested before its public release and chosen over Qwen3 30B-A3B and Qwen 3.6 35B-A3B for its smaller footprint, with the 4-bit quantized release as the default response model and the BF16 checkpoint kept for comparison. The build runs on a single workstation with an NVIDIA RTX PRO 6000 Blackwell Max-Q and an NVIDIA RTX PRO 4000 Blackwell, and the character follows a conversation flow where a "Please" breaks through immediately and "thank you" earns a warm farewell.

## Evidence

Verbatim from https://huggingface.co/blog/nvidia/nemotron-halloween:

> Building a Haunted House with NVIDIA Nemotron Open Models
> 
> Or rather…
> 
> Boo! Now Get Off My Lawn!
> 
> TL;DR: MonsterHouse is an interactive projection I created for Halloween. He listens to trick-or-treaters, answers in the voice of a grumpy old pirate ship and softens when visitors remember their manners. He is built on the NVIDIA Nemotron Voice Agent with NVIDIA Nemotron ASR , Nemotron 3.5 Bolt E4B 4GB , Magpie TTS Zeroshot and Audio2Face-3D , and he runs on a single workstation.
> 
> I wanted the kids visiting my house at Halloween to interact in a fun and unique way. The house was going to be in charge and giving out the treats, but more grumpy than scary. Somehow, my solution was to give the garage door a mouth and teach him to complain.
> 
> That became MonsterHouse: a grumpy old building with pirate stories, a fiery grin and a suspicious weakness for “please.” NVIDIA Nemotron Voice Agent supplies the conversation foundation. Nemotron Speech does the listening, Bolt E4B is the brain, NVIDIA Magpie TTS Zeroshot is the live voice, and NVIDIA Audio2Face-3D makes the wooden mouth talk.
> 
> How Monster House works
> 
> Listening: NVIDIA Nemotron Speech ASR turns visitor speech into text.

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