Zoop is a fast-paced puzzle game in which the player eliminates colored shapes that are approaching their alter ego, another colored shape, before they reach the top. In order to eliminate the other shapes, you must point your piece at it and 'fire'. If the shape is the same color as your piece, the shape is eliminated, as well as all of the shapes of the same color behind it, until your piece hits a piece of a different color. If the shape is of a different color, or it is hit when collecting a line of similar shapes, your piece exchanges colors with the shape.
The objective of Zoop is to clear as many lines as possible before they reach the top of the screen. The game requires quick thinking and strategic planning, as the player must anticipate the approaching shapes and eliminate them before they are too late.