Stage 1: Agree on how many you are
Four is the advertised limit for a run. If you have five people who want to play, someone is in a different session, not in the same lobby.
Decide this before you invite anyone, because the rest of the setup depends on it.
How you know it worked: everyone agrees on who is playing in this session.
Stage 2: Join the same server
Use the normal Roblox route: join from your friend's profile, or join the game and follow the invite. Servers hold up to 16 players, and on 30 October 2026 there were 46 public servers listed with 11 to 14 players each, so a public server usually has room.
We have not recorded the in-game screen that turns a shared server into a shared run. If your session does not put you on the same objective, that step is the one to look for.
How you know it worked: you can see your friend in the same space as you.
Stage 3: Confirm you are on the same objective
Read the objective bar out loud and compare it with your friend's screen. Matching text is a useful sanity check that you are progressing at the same pace.
It is not proof of anything: two separate sessions can show the same objective line, and the screen that confirms a shared run is the one we have not recorded. Use the bar to coordinate, not to conclude.
How you know it worked: you can both name the same objective and you know which step is still unverified.
Stage 4: Set a voice rule before the hunt starts
The game page says he hears your microphone. Voice chat is therefore a trade, not a free tool.
| You gain | You pay |
|---|---|
| Fast callouts about where he is | Every word is a position report to him |
| Coordination on who searches which room | Two people talking doubles the noise |
| Ability to warn about the fuse counter | Warnings arrive at the worst moment, when he is closest |
A workable rule for a first session: voice on between rooms, voice off while any of you is being chased. Nobody has to enforce it if you say it before you start.
How you know it worked: nobody speaks during a chase and nobody gets caught by a callout.
Stage 5: Split the work
The objective bar only names one job at a time, so splitting the room search is the one genuine advantage of co-op. One player sweeps the room the hint names; the others hold position and listen.
If the hint changes, everyone re-reads it. A team that keeps searching the old room after the counter moves is the most common way a co-op run loses time.
How you know it worked: the counter advances without anyone getting caught.
When co-op goes wrong
- Someone is not on the same objective. They may be in a different server. Rejoin from the same invite and compare the objective line again before splitting up.
- Voice keeps getting the team caught. Move to the between-rooms rule above.
- The hint names a room nobody can find. Finish the floor you are on before splitting further; a hint is a place name, not a direction.
We have not verified a revive or rescue mechanic. Nothing in the sources describes one, and we are not going to invent a number for how long a downed player stays down.
What single players should know
Everything above collapses to one rule: your footsteps and your microphone are the same channel to him. Playing solo removes the coordination problem and the chat problem at the same time, which is why the beginner guide recommends a solo run first.
Where to go next
Read Grinsworth before your next session: it lists what each of the four survival tools actually does. If you are still deciding what to buy, the store page separates permanent passes from single-run purchases.