Direct answer
Big Walk crossplay is supported across the confirmed platforms in the source material: PC, PlayStation 5, Mac, and Nintendo Switch 2. If friends are on different platforms, the host can share a unique Join Code so everyone can connect to the same session.
The source material also says Big Walk does not use online matchmaking. You need to bring your own group, because the game is built around a consistent team solving communication-based puzzles over multiple sessions.
Which platforms can play together
GamesRadar states that Big Walk supports crossplay for PC, PlayStation 5, and Switch 2. Other source material also mentions Mac alongside PC and PS5, with Steam and Mac App Store listed in the site research.
Xbox support is not confirmed in the source material. One YouTube transcript explicitly says there is no Xbox release, so any Xbox crossplay claim should be marked 待确认 unless official information changes.
How joining works
If your friends are on the same platform and already appear on your platform friends list, the game can show them in the connection menu. If your friends are on another platform, the host should generate a Join Code and share it with the rest of the group.
This makes the host important. The host starts the session, shares the code, and keeps the group moving through the first setup steps before everyone begins exploring.
No matchmaking
The source material repeatedly emphasizes that Big Walk is not built around random matchmaking. GamesRadar says the developers intentionally omitted online matchmaking so the same group can work together over multiple sessions.
That design choice matters because progress, tools, and puzzle knowledge are shared socially. If you start with a group, plan as if you will return with the same host and at least some of the same players.
No couch co-op or split screen
The source material says couch co-op is not available. Big Walk is intended for players to be physically separate, with communication managed by the game.
That also means Big Walk split screen should be answered plainly: no confirmed split-screen mode appears in the source material. If a player wants local same-screen play, mark that as unsupported or 待确认 rather than promising it.
Why in-game communication matters
Big Walk is designed around proximity chat. Several source entries warn against using Discord, Steam Voice, or other external voice tools because they can bypass the intended puzzle limitations.
In practice, distance and obstacles can change what players hear. That limitation is part of the experience, not a technical problem to route around.
Join Code tips
Use the Join Code when your group spans more than one platform. Read it aloud carefully, then wait until every player has loaded into the same session before the group starts walking.
If joining fails, the source material supports basic troubleshooting only: check versions, remake the session, and generate a fresh code. Anything beyond that is 待确认 unless it comes from official support.
Group size and crossplay
The source material says Big Walk supports up to 12 players, with the experience adjusted around group size. Smaller groups are easier to coordinate, while large groups create more chaotic communication problems.
For crossplay specifically, start smaller if your group has mixed platforms or new players. Once everyone understands Join Codes, proximity chat, and tool sharing, a bigger session is easier to manage.
Switch 2 voice note
One source entry flags a voice communication exception for Nintendo Switch 2. The exact limitation is not fully detailed in the visible source material, so the safest wording is 待确认.
If your group includes Switch 2 players, test communication before walking away from the start area. Do not assume external chat is the intended fix, because the game design relies on in-game communication limits.
Best setup flow
Pick one host, create the session, share the Join Code, and confirm every player can hear or communicate as expected. Then agree on how the group will signal yes, no, stop, follow, and regroup.
The cleanest Big Walk crossplay session is not the one with the fastest start. It is the one where every player understands that the communication limits are part of the puzzle.