Quest has the documented multiplayer update

Meta published a dedicated I Am Cat multiplayer update for Quest. Use that current Quest documentation and the multiplayer menu in your own build when setting up a session.

Steam VR and PS VR2 are separate answers

Steam labels the game single-player. The PlayStation listing describes offline play rather than promising online multiplayer. A Quest room or video therefore should not be treated as a hidden feature on the other platforms.

The I Am Cat location map
Location availability and feature availability both depend on the platform build, not the shared game title.

Do not assume cross-play

The presence of multiplayer on Quest does not establish cross-play, shared lobbies, or shared progression with Steam VR or PS VR2. Only plan around those features after an official source or the current in-game menu confirms them.

Check after major updates

Read the platform store feature list and current patch notes, then inspect the installed menu. Record the platform and build if the options differ from a recent guide.

A broad I Am Cat neighborhood view
A shared-looking world does not prove shared network features; verify the menu and store listing.

Related I Am Cat guides

Compare all platform differences →

Check PS VR2 first-session limits →

Sources

Official Meta multiplayer update →

Official Steam store page →

Official PlayStation Store listing →

I Am Cat community multiplayer page →