Using The Terminal Command and Emacs To Play The Video Game "Tetris"?
To start emacs just type emacs↩
This tells the shell to look for an executable file emacs in a directory listed in the PATH environment variable.

When in emacs run the command tetris that is escxtetris 

The controls are the arrow keys

Note that something seems to be wrong with the score file e.g. it won't save high scores etc.