The wait is officially over for horror fans looking to lose their minds—metaphorically and literally. NACON and ACE Team have announced that their highly anticipated cooperative horror game, The Mound: Omen of Cthulhu, is taking centre stage at Steam Next Fest from June 15 to June 22, 2026.

Starting today, PC players can officially download a free playable demo and take their first terrifying steps into a cursed, 16th-century South American canopy. To celebrate the hands-on event, the developers have unleashed a chilling new trailer giving us a direct look at the game’s oppressive atmosphere, psychological tricks, and tense squad gameplay. Check it out below!

Welcome to the Cursed Jungle

Developed by the eccentric minds at ACE Team (Zeno Clash, The Eternal Cylinder), The Mound: Omen of Cthulhu moves away from typical Victorian gothic settings to plunge up to four players into a deeply hostile historical jungle.

Your mission sounds simple on paper: set out from the safety of your galleon, take a rowboat to the mainland, complete high-stakes contracts, and recover legendary treasures. However, the supernatural forces dwelling within the jungle don’t just want to hunt you—they want to warp your mind.

Key Gameplay Features to Expect in the Demo:

• A Fragile Sanity System: As you venture deeper under the dense canopy, your sanity rapidly deteriorates. The game features highly individualised visual and auditory hallucinations. You might see the world drenched in blood, mistake deadly traps for mirages, or even see your teammates turn into monstrous entities.
• Proximity Voice Chat is Mandatory: Clear communication is your literal lifeline. The game relies on spatial audio. If a player panics, wanders off, and loses vocal contact with the squad, isolation will accelerate their madness. Even worse? Succumb entirely, and you might turn into a hostile creature controlled by the jungle, tasked with hunting your former friends.
• Trigger Discipline & Stealth: You are equipped with period-accurate gear like flintlock muskets, crossbows, and swords. Fire off a heavy musket, and the sheer noise risks awakening a reactive jungle that will aggressively hunt you down. Sometimes, running for your life back to the rowboat is the only real victory.

“We always say it existed long before the players got there, and I think you feel that when you explore. There’s stuff here that has nothing to do with you, wonders that weren’t put there for you to find.” — Edmundo Bordeu, Art Director at ACE Team

Play the Demo This Week, Launching This July!

The Steam Next Fest demo serves as a massive open test following the game’s recent closed beta, offering a substantial chunk of gameplay to tackle with your friends.

If you manage to survive the demo, you won’t have to wait long for the full expedition. The Mound: Omen of Cthulhu is scheduled to officially launch on July 15, 2026, coming to PC, PlayStation 5, and Xbox Series X|S with full cross-platform support.

Head over to Steam, grab your crew, download the demo, and see if you have what it takes to tame the jungle before it devours you.

Find out more here

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