the author of this app says:
A classic in games history. Play against the AI or other players (even online).
The famous Nine Men's Morris game in the palm of your hand. The game features local player vs player, player against AI and and even an online gaming mode! Play with people from all around the world to score more points or simply enjoy a round of Nine Men's Morris, Morris, Mill, Mills, Merels, Merelles or Merrills. Visit us at www.plusonelabs.com.
If you are not comfortable with the default controls, try the alternatives in the settings.