Connect Four is fun but not as much in 2D than in 3D!
You have 3 levels of difficulty against the computer: easy, normal and hard.
You can also play multiplayer against a friend on the same machine.
Also there is not only the "classic gamemode" where the player wins who manages to get 4 stones in a row first, there is also "Full Board" and "100 Stones" available!
GameModes:
Classic - the player wins who manages to get 4 stones in a row first.
Full Board - you play until no more stones fit on the board and the player with most complete rows wins.
100 Stones - every player has 50 stones and if a row is completed the player gets points and the stones will disappear. The game ends when all 100 stones were place. The winner is the player with most completed rows.