Hellfest reveals its 2026 lineup and announces the release of ARTE Riff Mountain!
Hellfest announced the release date of ARTE Riff Mountain, coming on November 21st, 2025, and revealed its official cinematic trailer.

Last October, Mohamed and Victor flew to Unreal Fest, following SoWhen?âs selection by
EPIC to present how we created a virtual world for Alstom. đ
Epic Games recorded the conference, and we can now share with you all the secrets behind this team effort!đ
đ€ Watch this video if you want to know:
Mohamed and Victor explain, using screenshots and videos, the composition of this complex Alstom virtual world, how we organized ourselves to achieve its creation, the different stages we went through, what user interactions are available today and in the future, the multiple A.I.s we created to make this world feel even more alive, what existing tools we used and what we tools we created for this project… A nice 35-minute summary to provide you with all the details!
Enjoy the video and feel free to share on social media. đ
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Hellfest announced the release date of ARTE Riff Mountain, coming on November 21st, 2025, and revealed its official cinematic trailer.
ARTE Riff Mountain will be featured at Paris Games Week, with an exclusive first demo available to the public.
After introducing the birth of the project in the first episode, this Dev Diary #2 dives into a key stage of the adventure: the conception phase.
SoWhen? was invited by SGA and EPIC to present a masterclass about our Multivert studio and a keynote on our co-production ARTE Riff Mountain.
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