Terminal has some games including Tetris, Pong, and Snake.
First you must find your Emacs version number. In the Terminal, type: cd /usr/share/emacs/ and press ENTER. Now type ls (lowercase LS) and press ENTER again. You’re given your Emacs version number (1.21, for instance). Write it down. Then enter the following: ls /usr/share/emacs/"VERSION"/lisp/play
Replace "VERSION" (no quotations) with the number obtained earlier and press ENTER. You get a directory of all the available games. Make a note of the games.
Switch to Emacs through Terminal by simply typing "emacs" without the quotations. To access the games, press Escape + X, and type the name of the game you want to play and press ENTER. You can switch to the next game by pressing Escape + X and type the name of the next game.
Good luck!