Run "$ ruby bin/hangman.rb" from the command line.
You will be prompted to enter a letter. If you enter any other valid string starting with a letter other than "load" and "save" it will take the first letter put in. You can save your game by typing "save" and specifying a file name. You can load a previously saved game by typing "load" and specifying a file name.
You will guess letters until you have six failed attempts. At that point, you will be "hanged".