Blow is at it's core a puzzle game. The object is to guide the bubbles to the exit at the end of the level. The player uses fans to Blow the bubbles in the correct direction. The fans can be angled to float the bubbles around corners and through paths. The fans can also be heated/cooled which can also affect how the bubbles float. To make the task more difficult, the world can have environmental effects that also affect the way the bubbles move through the world.
The music is new age and relaxing. The lack of a time limit, the soothing music, and the colorfull backgrounds set an unique mood for a puzzle game.