The Mound: Omen of Cthulhu Gameplay - The Madness System and Expedition Loop

The gameplay in The Mound: Omen of Cthulhu is a repeatable expedition loop for up to four players: take a contract, drop into a cursed jungle, extract treasure, and spend what you bring back on the next attempt. Everything below comes from the official Steam listing, which is the only public description of the systems.

The expedition loop, step by step

The store text reads as a sequence, and it is short enough to lay out in order.

• Aboard the galleon, sign a contract with the captain to receive gear in exchange for the treasures you bring back.
• Split weapons and equipment among the party before leaving.
• Choose which area of the jungle to explore next; the listing says going further means greater danger.
• On the mainland, coordinate through spatialised voice chat while searching for treasure.
• Recover logbooks from abandoned forts to unlock them as new starting points.
• Return the haul and repeat from the galleon.

That is the whole published loop. There is no crafting tree, no base building and no shop inventory described on the page.

Gear, contracts and who carries what

Gear arrives through the captain. The listing frames the contract as an advance: the player signs for equipment, and the treasure brought back settles the arrangement. It also says weapons and equipment are split among your party, which implies each pick-up has to be assigned rather than duplicated.

Nothing on the store page lists weapon types, gear slots or carry limits. Those numbers are not published, so they are not stated here.

Madness, perception and the horror systems

The madness system is the game's headline mechanic. The listing says the cursed jungle plays with your perception, that unpredictable threats distort your senses, that the line between reality and illusion blurs, and that paranoia spreads through the group.

Store claim	What the listing publishes	What it does not
Altered perception	Senses are distorted, reality and illusion blur	How the state is measured
Group paranoia	Paranoia spreads within your party	Whether it spreads player to player
Unreliable sensory input	You stop trusting what you see and hear	What cues stay trustworthy
Lovecraftian tone	Inspired by H.P. Lovecraft atmospheres	Any specific entity list

Everything in the middle column is the listing talking. The right column is the honest gap: no meter, no timer, no numbers.

Where the jungle fits in

The setting is doing mechanical work, not just flavour. The listing describes a cursed and hostile jungle where danger lurks around every corner, with Lovecraftian horrors warping reality as madness closes in, and it repeats that something out there is playing with your mind.

The store page also says the jungle breeds the strangest of creatures, and that it grows harder the deeper the party ventures. How many distinct areas exist, and what separates them, is not published.

What the listing never explains

Three things a new party would want are missing from the official page: how a player goes down and whether they can be revived, how loot is split between four people, and how long a single expedition runs.

None of those are on the store page or in the store data we captured, so this page does not invent them. The launch state, price and editions are covered on Launch & Demo, and the build and specs are on Availability.