Multiplayer in Voidtrain unlocks as soon as the host exits the prologue starting room and enters the Void onto the train tracks. You cannot invite friends directly from the pre-game main menu or while you are still inside the introductory building. Once you step through the doorway into the Void, the host can activate the session settings and let friends join.
When Does Multiplayer Unlock in Voidtrain?
According to official developer instructions on Steam, Voidtrain requires the hosting player to start a world and finish the brief opening tutorial sequence before co-op becomes accessible.
During the initial sequence, you customize your character and walk through a small building. Multiplayer sessions cannot be opened during this sequence. As soon as you open the door to the platform, see the train tracks, and step out into the Void, the session options become operational in your pause menu. Other players do not need to finish their own separate single-player tutorials first; they can join straight into the host's active world from the game's title screen once the session is live.
How to Host and Set Up a Multiplayer Session
Setting up a co-op lobby is handled entirely through the in-game pause menu by the player running the world.
- Start a new game or resume an existing save file.
- Complete the intro sequence, exit the starting room, and step into the Void.
- Press Escape to open the in-game pause menu.
- Select the Session option.
- Locate the setting labeled "Is it an open server?".
- Set the option to either "Only for friends" or "Yes".
- If desired, you can return to the Session menu later to close the server to new connections.
Setting the option to "Only for friends" restricts server visibility exclusively to users on the host's Steam friends list. Setting it to "Yes" allows any player using the game browser to find and enter your world.
How to Join a Friend's Game
Joining an ongoing game requires the host to already be loaded into the Void with their session turned on. If the host is still in the main menu or in the starting room, their name will not appear on the list.
- Launch Voidtrain and stay on the main menu.
- Click Find Game.
- Browse the server list for the host's username.
- Select the session to connect and spawn onto the host's trolley.
If the host's lobby does not appear, ensure the host has walked outside into the Void, checked the Session menu, and confirmed that "Is it an open server?" is toggled on.
Voidtrain Co-Op Features and Host Save Rules
The official Steam store page and developer community answers outline several key rules for Voidtrain's cooperative mode:
| Feature | Specification | Source Detail |
|---|---|---|
| Maximum Party Size | Up to 4 players | Official Steam store listing |
| Game Modes Supported | Single-player, Online Co-op | Official Steam store listing |
| World Save Location | Host device | Confirmed in Steam community discussions |
| Dedicated Servers | None | The world requires the host to be active |
| Server Visibility Options | "Only for friends" or "Yes" (Public) | Developer guidance in Steam discussions |
Because game progress is saved locally to the host's machine, guest players cannot run the world independently. If the host exits the game or turns off the server, all other crew members are disconnected, and returning to that specific train requires the original host to launch the game again.
Frequently Asked Questions
Can you play multiplayer right from the main menu?
No. The host must load into the game, complete the brief indoor prologue, and walk outside into the Void before the multiplayer session can be activated.
How many players can play together in Voidtrain?
The official Steam store page lists online co-op support for up to 4 players at a time.
Can friends continue playing if the host logs off?
No. Save progression is stored on the host's system, and there are no dedicated servers. When the host leaves, the session ends.
Why does my friend not see my server in "Find Game"?
This usually happens if the host has not yet opened the in-game menu, navigated to "Session", and set "Is it an open server?" to either "Only for friends" or "Yes", or if the host is still inside the introductory starting room.
