Dunnet is playable on any operating system with the Emacs editor. Emacs comes with most Unices, including OS X and distributions of Linux. Several articles targeted to OS X owners have recommended it as an easter egg as a game that can be run in Terminal.app. It can be run by running emacs -batch -l dunnet in a shell or the key sequence M-x dunnet within Emacs, the former being the preferred and official way to run it. Dunnet was used as a benchmark in the effort to port Emacs Lisp to Guile, progressing from running standalone games to running the entire Emacs system in less than a person-year of work.
The game starts out like most text adventures, with the player standing at the end of a dirt road, but it turns to the surreal when players realize that they are actually walking around inside a Unix system, and teleporting themselves around the Arpanet. There are many subtle jokes in this game, and there are multiple ways of ending the game.