If you’re ever using Emacs (Extensible Macro System) as an editor and feeling bored, you can always play Tetris in it. Playing Tetris in Emacs only works in the GNU environment which Mac OS X also runs under. The steps for running Tetris in Emacs have been provided below:

1. In Terminal, type emacs at the comment. Emacs will then appear for you.
2. In the Emacs window, press <ESC>. This will bring you to the note buffer section (shown below).
   

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