Unlike what people think of and write of, Terminal game isn't the correct term to be used; Instead, emacs game is the correct term.
Emacs version 22.1 first supports Mac OS X on June 2, 2007. The complete story of emacs can be read from wikipedia: GNU Emacs, if you're interested.
The first one I played is tetris, followed by dunnet, gomoku and the last one is 5x5.
If you're using Leopard now, you can open your Finder and then Go to Folder (Shift Command G): /usr/share/emacs/22.1/lisp/play. Inside there you can find all playable features. But some of them are just plain animation and unfortunately, some of them cannot be played. Don't ask me why, I also don't know.
To jump from one game to another, use the instruction above starting from step 3. After something like M-x appears on the bottom of your Terminal, you can type in the game name and execute it.
There also other playable animations and games that are quite interesting:
Some articles taken from our resource base, tightly related to current article, to empower you with more knowledge on tweaking the most out of your Mac.