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. The goal is to stop these shapes from reaching the top, similar to Tetris.
To eliminate the other shapes, you must point your piece at it and 'fire'. If the shape is the same color as your piece, both the shape and all of the shapes behind it are eliminated until your piece hits a piece of a different color. If the shape is of a different color or is hit when collecting a line of similar shapes, your piece exchanges colors with the shape.