Are you curious about the Geometry 3-Dimension and 4-Dimension Spaces as they relate to 3d-Puzzles?

The Digital Books are very easy to understand even with limited knowledge of basic geometry.

The Abridged PDF versions of each Book are now available: they do not include multimedia content such as videos, animations or quizzes.

Authors: Bernard & Pamela Cook Dreyer

After you buy a Digital Product an eMail will be sent to you with the link to the product to download. Check for more details about the Download of Digital Products in the section "Payment, Security and Download of Digital Products".

NOTE: Click here for the Multimedia versions of these Digital Books