4 in a row! Hack 2.2

Connect four discs of the same color next to each other vertically, horizontally, or diagonally before your opponent. You can play with a friend on your device or online or against the cpu with three difficulty levels.
The rules are similar to the tic-tac-toe, but with gravity: you have to drop 4 pieces instead of put them on the board.
The game also includes several different graphics.