Closed Beta for The Mound: Omen of Cthulhu
June 5–8, 2026 closed beta details for The Mound: Omen of Cthulhu — registration, PC access window, content scope, and improvements before Steam Next Fest.
Beta Window and Registration
Nacon and ACE Team ran a PC closed beta for The Mound: Omen of Cthulhu from Friday, June 5, 2026 at 2:00 PM CEST through Monday, June 8, 2026 at 10:00 AM CEST. The event preceded Steam Next Fest and the July 15, 2026 global launch, giving registered explorers a first cooperative look at contracts, sanity systems, and fort progression before the public demo opened June 15.
Registration flowed through the Nacon playtest portal at my.nacongaming.com. Selected participants received Steam keys and were directed to post structured feedback in ACE Team's official Discord #closed-beta-feedbacks channel. The beta has ended; this page preserves historical scope and changelog context for players comparing beta notes to the festival demo and retail build.
Console closed betas were not announced parallel to the PC event. PlayStation 5 and Xbox Series X|S pre-orders opened alongside the beta announcement, with console players awaiting hands-on access via the full release or future public demos.
What Beta Testers Experienced
Closed beta squads tested four-player online co-op with spatial voice chat, contract selection aboard the Tempestad, gear splitting, coastal and fort-adjacent jungle zones, sanity hallucinations, corruption on failed revives, and extraction pacing. ACE Team emphasized cooperative survival under psychological pressure — the same chaotic high-stakes loop featured in the later Steam Next Fest demo, though fort count and map scope expanded before the public festival build.
Beta participants who returned for Steam Next Fest noted substantial quality improvements documented in Demo Patch Notes: petting the ship dog, two additional map locations, weapon durability changes, melee collision upgrades, new sanity illusions, motion blur and camera smoothing toggles, faster appraisal sequences, PSO shader compilation, separated single-player prologue from multiplayer campaign, and rowboat UI showing logbook reading durations.
Cross-play was disabled in beta and demo slices even though retail launch supports PC, PS5, and Xbox Series X|S cross-play. Organize four PC friends for historical comparison videos; mixed-platform squads await July 15 unlock per Release Date & Platforms.
From Beta Feedback to Launch Polish
ACE Team and Nacon stated beta feedback directly shapes launch balance — corruption timers, musket noise radius, salt revive windows, and sanity readability were active tuning targets entering Steam Next Fest. Known issues tracked during the beta-to-demo transition included token economy edge cases, geometry stuck spots, appraiser payout bugs, and rare revive teleport glitches patched before or during the festival.
If you participated in the closed beta, compare your notes against the June 18, 2026 demo patch and this wiki's Y'm-bhi and Guides sections updated from post-beta developer communications. Retail launch on July 15, 2026 remains the authoritative mechanics reference.
Future playtests, if announced, will be linked from this hub and the homepage release badge. Wishlist on Steam or pre-order on console storefronts for launch notifications when new test windows open.
Frequently Asked Questions
Can I still join the closed beta?
No. The June 5–8, 2026 window has closed. Watch Nacon and ACE Team channels for any future playtest announcements.
Did beta progress carry to the demo or full game?
No official save migration was announced. Treat beta and demo progress as practice unless ACE Team confirms transfer support.
Was the beta under NDA?
Steam Next Fest demo was stream-friendly. Closed beta streaming rules followed Nacon playtest terms—check your invitation email for specifics.
How does beta content compare to the demo?
Same core co-op loop with fewer forts and pre-patch issues. Public demo added five forts and mid-festival gameplay updates.
Where was feedback submitted?
ACE Team Discord #closed-beta-feedbacks with structured tags per pinned guidelines. Steam discussions supplemented public reports.
Video Walkthrough
Watch the official gameplay footage below to see the techniques described in this guide applied in a real expedition.