This paper presents the details of the rhythm-based generator, and examples of the kinds of levels it can produce. The primary contribution of this work is its use of a two-layer grammar-based geometry generation system using rhythms that are made up of verbs, and the use of these verbs as a driver for geometry generation. The level generator can be guided by a human designer who tweaks the style of levels. The paper also presents a set of algorithms that operate on the level as a whole, including critics that determine how good a level is according to style parameters, and a method for decorating a level with coins.