Spheres roll along a winding track toward a pit in the middle, and you fire your own spheres into the line to blow up matching colors before the whole chain arrives. It is the Zuma shape, and Zend Bomber plays it quickly: the track is visible all the way around, so the real skill is reading the order of what is coming rather than reacting to what is in front of you. Combos clear far more than single shots, and the later levels assume you are chasing them.