sm64coopdx on Mac: how to play Super Mario 64 online co-op

sm64coopdx runs on a Mac. It is a Super Mario 64 PC port built for online multiplayer, with every level and enemy synced between players and Lua mods, made by the Coop Deluxe team. The current release, 1.5.1 (May 31, 2026), ships a Mac build (separate native builds for Apple Silicon and Intel). You supply your own copy of the game; sm64coopdx supplies everything else.

How to install sm64coopdx on a Mac

1. Download the zip for your Mac (ARM for Apple Silicon, Intel otherwise) from the releases page and unzip it.
2. Move sm64coopdx.app into Applications. The 1.5.1 notes say Mac users must install that update by hand rather than through the built-in updater.
3. Get past Gatekeeper. macOS blocks it the first time because the project is not signed by Apple. Control-click the app and choose Open. On macOS 13 or later, if that offers no Open button, go to System Settings, then Privacy & Security, and click Open Anyway (it appears for about an hour after the first attempt).

sm64coopdx on its official page: download only from there. Sites offering a version with the game already inside are pirated, and often carry malware.

The game file you need

Your own copy of Super Mario 64: the US version as a .z64 file. Other regions are not accepted.

The first screen says no ROM was detected and asks you to drag your Super Mario 64 (US) .z64 onto the window. Do that and it copies the file into its own folder and starts.

What you get

• Online co-op, hosted or joined from the menu
• Lua mods (a large library at mods.sm64coopdx.com)
• Discord integration

Saves and settings live in ~/Library/Application Support/sm64coopdx/ (mods and config live here too).

More classic games on Mac

Checked October 15, 2026 against: Releases, Project. Architecture, minimum macOS and signing were read from the Mac release files themselves.