Can you play Mecha Chameleon with friends?

Yes. The game supports Steam friend invites directly from the lobby screen. The host creates a private room, picks the map and mode, and invites friends through the Steam overlay. No third-party tools or port forwarding needed.

How many players can play Mecha Chameleon together?

Lobbies are designed for 2 to 10 players, with support for up to 24 players depending on the host's network environment. Normal mode suits small groups of 2–4; Infection modes shine at 6–10 players.

Do I need crossplay to play Mecha Chameleon with friends?

No. Mecha Chameleon is Windows PC only via Steam, with Steam Deck Playable support. Every player is already on the same platform, so crossplay is not a separate feature - it is the default. There is no macOS, Linux, console, or mobile version at launch.

Can I play Mecha Chameleon with friends on a public server?

Yes. Create a public room instead of a private one, and any Steam player can join. This is the standard way streamers host viewer-participation rounds and how community game nights find opponents.

How to Play Mecha Chameleon With Friends: Lobby Setup Guide

Why Multiplayer Setup Matters in Mecha Chameleon

Mecha Chameleon is built around multiplayer hide-and-seek rounds - the entire game loop, from the prep window to the Seeker sweep, assumes multiple players. Single-player modes exist, but the game’s replay value lives in lobbies: 2-player 1v1 duels, 6-player Normal rounds, 10-player Infection mode, and 24-player custom rooms. Getting your lobby setup right is the difference between a quick casual round and an extended community game night.

This guide covers every way to play with friends: private lobbies, public rooms, Steam Deck sessions, and the practical limits of lobby size. For platform-level compatibility, see our Steam Deck & Multiplayer Setup Guide; here we focus on the friend-invite flow.

Quick Start: Play With Friends in 60 Seconds

If you have launched the game and your friends are online:

Launch Mecha Chameleon from your Steam library.
From the main menu, choose Multiplayer → Create Room.
Set the room to Private (toggle in the lobby settings).
Pick your map (Mansion is the friendliest default) and mode (Normal for casual rounds).
Open the Steam overlay (Shift+Tab) and invite friends from your friends list.
Friends accept → they join your lobby directly.
When everyone is ready, the host presses Start Round.

That is the entire flow. There is no port forwarding, no IP address sharing, and no third-party lobby tool - Steam’s friend-invite system handles it.

Private vs Public Lobbies

The lobby toggle decides who can join:

Setting	Who Can Join	Best For
Private Room	Only invited Steam friends	Casual sessions with a fixed group
Public Room	Any Steam player in the region	Community play, viewer games, finding opponents
Friends-Only Room	Steam friends + mutual friends	Open-but-curated; rare in this game

Most players default to Private. Switch to Public only when you specifically want strangers to join - for example, when streaming and wanting viewer participation, or when running a community game night where the invite list is too long to handle individually.

Lobby Sizes and Modes

Mecha Chameleon supports several modes, each tuned for a specific lobby size:

Mode	Best Lobby Size	Round Length	Notes
Normal	2–4 players	~3–5 min	Classic hide-and-seek. Best for first-time friends.
Normal (full)	5–8 players	~5–7 min	Standard community play. Mansion or Osaka are friendliest.
Infection (Increasing Oni)	6–10 players	~7–10 min	Caught hiders join the Seekers. Best with full lobbies.
Double	4–8 players	~5 min	Everyone hides, then everyone seeks. Fastest side wins.
Large custom rooms	10–24 players	~10–15 min	Depends on host network and map scale. Workshop maps recommended for big lobbies.

If you have never played with a friend before, start with a 2-player Normal round on Mansion. Mansion is the friendliest official map for new players (per our Best Hiding Spots guide), and 2-player rounds finish quickly so you can iterate on your paint workflow without long downtime.

Step-by-Step: Detailed Lobby Walkthrough

From your Steam library, launch Mecha Chameleon. The main menu has four buttons: Single Player, Multiplayer, Maps/Workshop, and Settings. Click Multiplayer to reach the lobby screen.

Step 2 - Create or Join a Room

The multiplayer screen shows two buttons:

Create Room - you become the host and configure the lobby.
Join Room - you browse public rooms and join an existing one.

For playing with friends, Create Room is the default. Pick a memorable room name (your Steam display name plus a tag like “Mansion-2v2”) so your friends can identify it in their friends-list notifications.

Step 3 - Configure Map and Mode

The room configuration screen shows map and mode selectors:

Map selector - choose from the five official maps (Osaka, Penguin Hotel, Sugarland, Mansion, Sewer) or any subscribed Workshop map (see our Workshop Custom Maps Guide).
Mode selector - Normal, Infection, Double, or Custom.
Player limit - set the maximum number of players (2–24).

Choose your map first, then your mode, then your player limit. The map choice has the biggest impact on round feel - Mansion is forgiving, Osaka is fast, and Penguin Hotel rewards paint skill.

Step 4 - Invite Friends

Once the room is configured, the lobby screen shows a list of connected players (just you, for now). To invite friends:

Press Shift+Tab to open the Steam overlay.
Click Friends List in the overlay.
Right-click the friend you want to invite → Invite to Game.
Steam sends an invite notification to your friend.
Your friend accepts the invite → they spawn into your lobby automatically.

You can invite multiple friends in sequence before pressing Start Round. There is no hard cap on invites, but the room’s player limit is enforced when the round starts.

Step 5 - Start the Round

When all invited friends have joined and the lobby shows the full roster, the host presses Start Round. The game runs the prep window (time to hide), and the round begins.

Playing on Steam Deck With Friends

Mecha Chameleon is rated Steam Deck Playable, which means you can host or join lobbies directly from a Steam Deck in handheld mode. The Deck’s built-in controls handle movement and posing comfortably, though fine paint work benefits from the trackpads for cursor precision.

For the full Steam Deck walkthrough, see our Steam Deck & Multiplayer Setup Guide. The short version: launch from Steam Deck’s library, choose Desktop or Gaming Mode, and the rest of the multiplayer flow is identical to desktop.

Public Rooms and Community Play

Public rooms work the same way as private rooms, but with the room privacy toggle set to Public. Any Steam player in your region can see your room in the server browser and join it without an invite. This is the standard mechanism for:

Viewer-participation streams - streamers host a public room and read viewer names aloud as they join.
Community game nights - community discords schedule a time, the host creates a public room, and members join freely.
Finding opponents - if your friends list is empty and you want a round, browse public rooms and join one.

Public rooms have no built-in moderation tools beyond Steam’s friend/block system. If you encounter a toxic player, block them on Steam and they will not be able to join future rooms you host.

Common Multiplayer Mistakes

Starting the round with only one player. The host must wait for at least one friend to join before pressing Start, otherwise the round starts as a single-player round against AI Seekers.
Forgetting to set the room to Private. A default public room means strangers can join, which is rarely what friend groups want.
Choosing a Workshop map before subscribing. Workshop maps must be subscribed and downloaded before the host can select them. See the Workshop Install Guide.
Hosting on a slow network at 24 players. Large lobbies stress the host’s upload bandwidth. Test your network with a 6-player round before committing to a 24-player community night.