How to play Fireboy and Watergirl 1 The Forest Temple online is answered by Steam Remote Play Together on the standalone Steam release of AppID 5084260. The host launches the Steam build, invites a friend through Steam Remote Play Together, and the friend streams the game from the host's machine and shares the controller or keyboard. Native Steam online multiplayer beyond local co-op is not announced as of 2026-09-06. Steam Family Sharing cannot be used to co-op a single purchase across two machines because both players need to operate the same keyboard at the same time on the host.
How to set up Steam Remote Play Together for Forest Temple
Confirm the host owns AppID 5084260
Only the host needs to own Fireboy and Watergirl 1 The Forest Temple on Steam AppID 5084260. The friend joins the Remote Play Together session without buying a copy. The friend must be on the host's Steam friends list.
Done when: The Forest Temple AppID 5084260 is in the host's Steam library and the friend is on the Steam friends list.
Launch the game on the host machine
On the host machine, open the Steam client and launch Fireboy and Watergirl 1 The Forest Temple to the title screen. Remote Play Together requires the host to actually run the game; the friend streams the running game rather than launching a copy on their own machine.
Done when: The host's Steam client shows Forest Temple running and the title screen is visible on the host display.
Open the Steam overlay and invite the friend
Press Shift+Tab to open the Steam overlay, click the friend's name in the friends list, and choose Remote Play Together > Invite to Remote Play. Steam sends the invite through Steam friend chat, and the friend accepts it from their own Steam client.
Done when: The friend receives the Remote Play Together invite and accepts it.
Friend accepts and the stream starts
Once the friend accepts, Steam starts the Remote Play stream from the host's machine to the friend's client. The friend now sees the host's Forest Temple session with their own input mapping. The friend plays Watergirl through a virtual controller; the host plays Fireboy on the same keyboard.
Done when: The friend sees the host's Forest Temple session stream and can press buttons.
Use Steam voice chat during the session
Use Steam friend voice chat during the Remote Play Together session to coordinate Fireboy and Watergirl timing. The voice chat is end-to-end inside the Steam client and does not require any third-party app.
Done when: Both players confirm they can hear each other and can coordinate moves.
Latency expectations and when Remote Play Together will struggle
Steam Remote Play Together latency depends on the upstream bandwidth of the host and the network round-trip between the two players. For Fireboy and Watergirl 1 The Forest Temple specifically, the latency tolerance is generous because the Forest Temple chapter is a turn-based puzzle rather than a twitch shooter: the simultaneous-button cooperative triggers need two characters to step on switches within roughly half a second of each other, not within the same frame. A reasonable home broadband connection on both sides is enough to make Remote Play Together playable. Remote Play Together will struggle when the host's upload bandwidth is low (under 5 Mbps), when either player's network round-trip is over 100 ms, or when the host's machine is doing heavy other work. Players who see Remote Play Together rubber-banding should check Steam's network indicator in the overlay; if the indicator shows red, drop the stream quality or close other apps on the host.
FAQ
Does the Steam release support online multiplayer?
Steam online multiplayer beyond local co-op is Not announced as of 2026-09-06. The Steam build supports local two-player co-op on one keyboard.
How do I play Forest Temple online with a friend?
Use Steam Remote Play Together on AppID 5084260. The host launches the game and invites the friend through the Steam overlay; the friend streams from the host's machine and uses a virtual controller for Watergirl. Native online multiplayer is not announced as of 2026-09-06.
How do the cooperative controls work?
The original Oslo Albet design places Fireboy on WASD or arrow keys and Watergirl on the arrow keys as a paired second player on one keyboard; the Steam build adds controller support and Steam Cloud.