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This is not the current version.

Step 1: download
Click on the link below to download NetHack. Depending on your browser you may need to right-click so that the file is saved to disk and not displayed.

NetHack-361-mac-Term.pkg (about 2.5M) (MD5 sum: 67e57c92d6494fb428d8c35b51f78c69)
NetHack 3.6.1 for Intel Macintosh running MacOS 10.7 Lion and later. This is a very traditional NetHack that runs in text mode from the command line or from Finder.

Download this file
Step 2: Mount
If your browser did not mount the image, double-click on the downloaded file and MacOS will mount the image and start the Installer.
Step 3: Install
If the Installer has not started, double-click on the package file. The MacOS X Installer program will start and ask for the root password. The game will be installed under /usr/local/games and /Applications.
If you will be running NetHack from the shell, edit the $PATH variable for your shell to include /usr/local/games/bin.
Step 4a: Run from the Command Line
Run nethack in a Terminal window. The man pages are in /usr/games/man and the Guidebook is in /usr/games/doc.
Step 4b.: Run from Finder
The following applications are in the Applications folder:
- NetHackTerm the game
- NetHackGuidebook the documentation
- NetHackRecover a program for recovering after a game or system crash

Hosted courtesy of alt.org.