Morris is an implementation of the board game "Nine Men's Morris". From the 12th to the 18th century, Nine Men's Morris was one of the most popular board games in Europe. However, it is still actively played today and exists in several variants, e.g., Morabaraba, which is particularly popular in South Africa.
This implementation of Nine Men's Morris supports not only the standard game, but also several rule-variants and different board layouts. The computer opponent learns from previous games and tries not to make the same mistake twice. This ensures enough variation in game-play, should you once have managed to beat the program.