Multi Launcher is a lightweight editor dock plugin for Godot 4 designed to make local multiplayer and multi-client testing fast, simple, and reliable.

It automatically loads your project's configured Main Scene and spawns multiple standalone, fully resizable sub-windows directly inside the editor—no @tool directives required on game scripts and no need to compile standalone builds.

🚀 Key Features:

Instant Multi-Instance Testing: Automatically reads your project's Main Scene setting and launches 1 to 99,999 independent game instances with a single click.

Fully Resizable Windows: Every spawned instance runs inside a flexible, resizable Godot window with minimum size protection to fit any layout or multi-monitor setup.

No @tool Required on Game Scripts: Button presses, UI interaction, and scene transitions inside sub-windows work natively via launcher-side signal delegation.

Per-Instance Custom IP Setup: Assign custom IP addresses dynamically to test local client/server networking, lobbies, or peer-to-peer setups.

Metadata IP Injection: Automatically attaches an assigned_ip metadata key to each window for instant retrieval in your network code (get_window().get_meta("assigned_ip")).

Title Bar Customization: Optionally display assigned IP addresses in window titles for effortless client identification. Auto-Expanding Input Fields: Custom IP text fields automatically stretch to fit text length as you type, keeping the dock layout clean.

One-Click Cleanup: Instantly close all open test instances with a dedicated "Close All Instances" button.

Universal Editor Compatibility: Pure Godot 4 solution—works seamlessly across Windows, macOS, and Linux.

🛠️ Quick Start:

Set your Main Scene under Project -> Project Settings -> Application -> Run -> Main Scene.

Download and enable the plugin under Project Settings -> Plugins.

Open the Multi Launcher panel in your editor dock.

Set your instance count, configure optional custom IPs, and click Launch.