The Mound: Omen of Cthulhu Steam Next Fest Demo: Forts, Galleons, and Noise Mechanics

The playable demo for The Mound: Omen of Cthulhu is officially live on Steam for the June 2026 Steam Next Fest, running from June 15 through June 22. Developed by ACE Team and published by Nacon, this pirate-era cosmic horror title has already earned praise in recent hands-on previews for its atmosphere and cooperative tension.

For players who missed the Closed Beta or want to see how the game has evolved ahead of the official release date on July 15, 2026, this demo offers a significant content upgrade, introducing five distinct forts to explore.

The Core Gameplay Loop: Galleons and Rowboats

Expeditions in the demo start on your team's galleon hub. This serves as the lobby where up to four players coordinate loadouts, purchase gear, and select their destination. Once ready, the squad boards a rowboat to head into the jungle.

This loop emphasizes planning and resource management before setting foot on land. You will need to coordinate who carries what equipment, as survival depends heavily on your team's utility.

A Shifting, Noise-Reactive Jungle

The jungle of The Mound is not a passive backdrop. It actively responds to player actions. Sound and environmental destruction carry heavy consequences: * The Noise Meter: Causing noise (such as firing un-silenced weapons or running) alerts the environment. * Escalating Threat: As the environment wakes up, it summons aggressive creatures to hunt your squad. * Sanity Penalties: The dense canopy and lurking horrors feed into the game's sanity system, distorting your vision and audio as your mental state deteriorates.

Keeping a low profile is essential. Stealth is often a better option than fighting every creature you encounter.

Exploring the Five Forts

While the Closed Beta offered a more restricted experience, the Steam Next Fest demo features five forts. These locations contain cursed treasures that squads must secure and extract back to their galleon.

Each fort features unique layouts and hazards, requiring teams to adapt their strategy. The risk increases with each treasure collected, as extracting them triggers aggressive counter-attacks from the island's inhabitants.

Discord Quests Integration (Community-Reported)

In addition to the demo launch, players in the community have discovered references to a potential Discord Quest integration. File paths uploaded to community forums indicate the Discord Quest executable location is expected to be under ..\The Mound Omen of Cthulhu\Binaries\Win64\TheMound-Win64-Shipping.exe. While Nacon has not officially announced details, this suggests that a Discord-themed reward campaign may run alongside the demo or the upcoming launch.

If you want to prepare your system for the full release next month, check out the expected system requirements. For those curious about how this stack up against other extraction games, read our comparison with Lethal Company and GTFO.