To download mud's source code, first find the mud's official source code repository or an open-source code托管平台, such as GitHub or GitLab.
On that platform, search for "mud" and find the corresponding project's page.
On the project's page, locate the download source code option, typically there is a "Download" or "Clone" button.
Click the button to access the download link, which will allow you to copy the link.
Then, either in the local command line or in the terminal, use the git command to clone the repository, such as entering "git clone <copy the link>" to download the source code to your local file folder.
If you don't have git installed, you can manually download the project's zip file and then extract it to your local folder.
This process will guide you through the steps needed to obtain the source code for mud.