The game Bubble Sport Shooter probably got this famous as it is very intuitive and easy to learn. Its some kind of mix of "Tetris" and "Connect Four" - thats probably why its so easy to get into the game. Some notes on the rules and how to control the game:
The aim of Bubble Sport Shooter is to collect as many points as possible. To get points you need to destroy the colored bubbles. In order to burst those bubbles you need to row/connect at least three bubbles of the same color.