This is a single player game and targeted at very young audience; a very basic and simple game of tapping randomly appearing avatars / smilies on the screen.
There are 2 types of avatars, one which give you points and the other which eat into your score and life i.e. you get points for tapping good (smiling faces) similes but if you tap bad avatars, points are deducted from your score. So, be careful not to hit bad smilies and collect as many good similes as possible to keep scoring high.
There are 5 difficulty levels in the game. Basically, the time interval these avatars stay on the screen for, is reduced respectively as we move to a higher level i.e. they start appearing and disappearing even more quickly, giving very little time to act.