4 in a row!

Put four discs of the same color next to each other

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.