Canonical source: plugins_default/multiplayermaphost/README.md - edit that file, not this page (this page is built live from it, nothing here is a tracked copy).

Minerva

Internally identified as "Minerva" (PluginMeta.name, distinct from its folder/identifier multiplayermaphost) - lets the in-editor map maker test a map in a real, live multiplayer match instead of the editor's own offline preview.

What it actually does

Only active for real players when the map editor page loads it (isEditor gate in shared.js) - it adds a "Test ONLINE" button next to the editor's existing offline test button. Clicking it saves the current map to localStorage (mapBackup) and opens a new tab at ?testMapOnline=<gametype>. That new tab, on load, requests a private game and (via game:onExtraParams) attaches the map pulled back out of localStorage as extraParams.customMinMap.

Server-side, the actual gate this unlocks is documented in Known Quirks: RoomConstructor hardcodes acceptCustomMaps = false, and this plugin's game:roomBeforeMapBuild listener is what flips it back to true for the room being created - without this plugin installed, the "send a custom map to a private room" pathway exists in core code but is unreachable.

Notes

A meaningful amount of the plugin's own source is dead/commented-out ("former logic" comments throughout shared.js, and an unused MultiplayerMapHost.registerListeners(this.plugins) call left commented out in index.js) - this plugin was clearly trimmed down from a larger feature set at some point. What's described above is what's actually active today; don't assume the commented-out code still runs.

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This page was drafted with AI assistance and reviewed for accuracy. If something looks wrong, please open a PR or flag it.