1. PlayTicTacToe This is a version that two players can play.
2. RandomAI This is a version that a player can play against an AI that makes a random move.
3. SmartAI This is a version that a player can play against an AI that makes a smart move. AI only wins or at least draws.
4. Learning This isa version that a player can play against an AI that learns as several games are done. AI learns the winning combination used when it loses or accidentally wins a game. AI improves as many games are done, being able to use the winning combinations it learned.