Abstract: A self-contained puzzle includes an axially extending tube with first and second end caps mounted on opposite ends. A plurality of gears are concentrically and rotatably mounted about the tube between the first and second end caps. Slide support elements on each of the gears form channels therebetween which slidably receive a slide element which is manipulatable from a channel in one gear to an aligned, empty channel in an adjacent gear. The exterior surfaces of the slide elements form a mosaic when assembled and contain indicia forming a puzzle or design. Releasable lock members are unitarily formed on one of the tube or each gear and releasably engage axially extending grooves formed in the other of the tube and each gear to temporarily lock each gear in a selected angular position about the tube relative to adjacent gears.