There are two main modes, singleplayer and multiplayer. Singleplayer has three levels, beginner, experienced, and expert. Beginner just picks a random spot while expert uses an algorithm, experienced uses a simpler algorithm for less intensity.
Multiplayer lets two friends play with any situation. They can play on the same computer, or they can use the online mode. With an internet connection, the two users can easily connect from around the world and play as many games as they like.