This is the simplest set of requirements I could come up with for Hangman.  Please let me know if you see something that is missing or incorrect. 

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Welcome Screen:

1. Display “Play” button
2. If user selects “Play” button go to Game Play Screen
3. Display “Info” icon
4. If user selects “Info” icon flip to show info page

Info Screen:

1. Display credits
2. Display link to GTi website
3. Solicit feedback
4. Display “Done” button

Game Play Screen

• To start a new game the system selects a text string (word or phrase) from the string library and displays blanks for each letter. Spaces are shown
• Display the alphabet as selectable letters
• If the user selects a letter the system checks to see if that letter is in the text string.
  1. If the letter is in the text string show it in the proper location(s) in the string
  2. If the letter is not in the text string draw the next portion of the hangman
  3. Show that the letter has been guessed and don’t allow user to select that letter again during the game

• Before proceeding
  1. check to see if the whole text string has been revealed. If yes, tell user “You Won!” and show “Play again?” button.
     1. If user presses “Play again?” button start from beginning.
  2. check to see if the whole hangman has been drawn. If yes, tell user “Too bad.” and show “Play again?” button.
     1. If user presses “Play again?” button start from beginning.

• If game has not ended then continue by prompting user to select the next letter.