Happy is a game designed to make you smile and feel positive about life and everything you do.
You can play the Happy game in two modes: Day and Night
In Day Mode : you match the same happy faces and launch the face. 3 likely face destroys the happy face which is hanging in the tree.
The happy faces generated by the monster gets attached to other faces creating a chain of faces. If the chain of faces touch the launcher you lose the game. Your goal is to destroy all hanging happy faces to go to the next level.
In Night Mode : you get the sad faces. And the same rule follows here to destroy all sad faces to go to next level.
You can change the modes from the setting.