How to make a R.E.P.O. style co-op physics horror game with AI

Make hauling feel like a group decision

A co-op physics horror run becomes tense when the valuable thing is also inconvenient to move. A narrow doorway may require two players to turn a long object together; a fragile find may force the carrier to walk carefully while a teammate watches the corridor. The team is balancing value, noise, route length, and the chance of leaving empty-handed. Keep the goal easy to explain: search a dangerous place, carry enough salvage back, and get out before the situation becomes worse. Sandbox games use the same object physics for open-ended play. Games like Terraria show a calmer version of co-op scavenging.

Make fear readable enough to play

Horror is stronger when players can notice a warning and still feel pressure to act. A distant scrape might signal a creature moving between rooms; a flickering work light could mark a route that is becoming unsafe. Give threats distinct cues and a fair response, such as hiding, retreating, or helping a teammate who dropped cargo. The danger should interrupt a plan without making every mistake an instant loss. Vary quiet search with short bursts of urgency so players have time to talk and react. Clear sound effects for distant threats give players that warning. Survival mechanics such as stamina can raise the pressure.

Build a cooperative salvage run

1. Set the 3D camera and layout

   Choose 3D at creation, since Chatforce does not let you switch between 2D and 3D afterward. Describe the first-person or over-the-shoulder camera, how much of a carried object remains visible, and whether players can turn quickly in tight spaces. Chatforce's 3D environment supports a real-time world, generated models, lighting, and a directable camera. Keep the opening site small: one safe staging area, a main corridor, and a few rooms with distinct landmarks. This gives players a mental map and makes the trip back to extraction a meaningful choice.

2. Define cargo and handling

   List a handful of salvage objects with different weights, shapes, and values. A small brass instrument can fit through doorways but be worth little; a long cabinet may pay well and require two people to maneuver. Specify how a player picks up, drops, rotates, and passes an object, plus what makes a fragile item take damage. Physics should create funny coordination problems without turning basic movement into a struggle. Explain how the object communicates its condition and value so the team can decide whether the risk is worthwhile.

3. Give threats warning and counterplay

   Design one threat at a time and state its cue, behavior, danger, and counterplay. For example, a shape could drag a chain across the floor before entering a lit room, giving players a moment to hide or retreat. Make audio and visual signals distinct from ordinary ambience. Say whether a player can rescue a teammate, lure danger away, or recover dropped cargo afterward. If threats react to noise, explain what actions create it. This makes the group's choices matter and lets players learn the location through observation instead of random punishment.

4. Set the quota and escape

   Choose how the run is measured: a salvage quota, a time limit, or a limited number of dangerous trips. Tell players where extraction is and what they lose if they leave cargo behind. An end-of-run summary can show recovered value, damaged items, and who made it out, giving the team a reason to adjust tactics next time. Ask Chatforce for one short playable mission with a few objects, one threat, and a clear exit. After playing with friends, report whether anyone got lost, overloaded, or unsure when to leave.

Example prompt: Make an original 3D online co-op horror game about a salvage crew searching a flooded observatory for valuable instruments. Use a directable over-the-shoulder camera, dim work lights, a clear entrance, and three rooms connected by a return corridor. Objects vary in value and weight; a long brass telescope needs two players to carry through a narrow doorway. Add one threat that signals its approach with a dragging chain and can be avoided by hiding or retreating. Give the crew a salvage quota and extraction point. Use original names, characters, art, music, and story.

Test carrying, navigation, and scares

Try moving every object through the tightest doorway and check that the camera does not hide the route or teammate. If the physics causes constant accidental drops, reduce wobble or make pickup behavior more predictable. Watch whether players understand a threat's warning and have time to make a group decision. Change one source of confusion per iteration, then run the route again. Chatforce typically creates a first playable in 10 to 15 minutes; use the early build to tune the central haul-and-escape loop before adding more rooms or creatures. Stealth games deal with the same sightline questions.

Publish a crew mission

Chatforce supports online multiplayer in 3D for up to 8 players per room. State how players join, whether cargo value is shared, and what happens if someone is separated from the group. Once the mission works, publish it as a browser-playable game at a shareable URL; friends can play without an account. The creator owns the work, and published games have no watermark. A short mission with a concrete quota is easy to explain when you send the link to a crew. If you are comparing engines for co-op 3D, the Roblox Studio alternative page covers that route. Co-op climbing in PEAK-style games uses the same shared risk.

Frequently asked questions

Can I make a direct copy of R.E.P.O.?

Use it as a broad reference for co-op physics horror and hauling valuables through danger. Make an original game with your own names, characters, art, music, and story, and create distinct locations and threats.

Can friends play together online?

Yes. Chatforce supports online multiplayer in 2D and 3D for up to 8 players per room. Describe how a crew shares objectives, carries cargo, and handles separation or rescue.

Can Chatforce make a 3D haunted building?

Chatforce supports a real-time 3D world with generated models, lighting, and a directable camera. Describe the room layout, camera, cargo behavior, and threat rules in your prompt.

Related pages: Multiplayer game guide · Multiplayer game maker · 3D game maker · Browser game maker · Games made with Chatforce