The Mound: Omen of Cthulhu Steam Next Fest Demo Live Now

ACE Team has released a playable demo for The Mound: Omen of Cthulhu as part of Steam Next Fest, running from June 15 to June 22. If you missed out on the recent closed playtests or want a taste of this pirate-era cosmic horror before its official launch on July 15, 2026, now is the time to gather a squad and row into the jungle.

Compared to previous closed tests, the current demo features a massive upgrade, giving players a broader look at the shifting gameplay loop.

Explore the Shifting Canopy

The biggest addition to this demo is the availability of 5 explorable forts. Rather than limiting players to a single starting area, this build showcases how environments change and react to your presence.

Your expedition begins at your squad's galleon hub. Here, you and up to three teammates purchase essential gear, plan your route, and board a rowboat to head ashore. Once under the dense canopy, your objective is to locate cursed treasures and escape.

Surviving requires more than just shooting straight. The jungle itself is a hostile entity that reacts dynamically to noise and environmental damage. Chopping down thick vines or firing loud flintlock pistols alerts the environment, increasing tension and waking up terrifying creatures that stalk the foliage.

If you are stepping under the canopy for the first time, checking out a beginner tips guide will help keep your squad alive.

Keeping Your Wits in the Dark

Stealth and trigger discipline are critical. Making too much noise triggers the game's reactive systems, making paths more hazardous and accelerating your team's sanity decline.

Like many Lovecraftian games, keeping your mind intact is as important as managing your ammunition. The game's sanity system introduces visual distortions and psychological threats that worsen as the jungle becomes more aggressive.

Before downloading, check out the expected system requirements to ensure your PC is ready for the dense foliage and fog effects.

Launch Details and Pre-Orders

This demo serves as the final public test before The Mound: Omen of Cthulhu releases on July 15, 2026. Players looking to secure their copy early can browse the available pre-order bonuses in our pre-order editions guide.

Details on target platforms and console versions can be found in our overview of platforms and pricing.

The demo is only available until June 22, so grab your rowboat and test your resolve while the event lasts.