Because of copyright laws, the executable does not come with Nintendo’s proprietary game data. You must provide your own legally obtained ROM file to run the game:

To play , you need to provide your own legally obtained Super Mario 64 US ROM (.z64) to the game's executable or build tool.

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is available on the main site for community support, matchmaking, and modding updates. ROM Requirements

Developed by a passionate modding community (with major contributions from developers like , AloXado320 , and others), Co-op DX takes the original 1996 Nintendo 64 classic and retrofits it with modern netcode. The result is a fully functional, online multiplayer version of SM64 that supports:

: To compile or run the game, the user must provide their own legally owned Super Mario 64 ROM (typically the "Z64" format). This ensures that the developers are not distributing Nintendo's proprietary art, music, or code. Community Standards

The term is technically a misnomer. Let’s break down the terminology:

To play , you must provide your own original Super Mario 64