Built to Rule

Built To Rule was marketed as "Action Building Sets". All sets came with one set of building blocks you could build into a full sized vehicle, and one specially designed 3 3/4 G.I. Joe figure. The forearms and the calves of the figures sport places where blocks could be attached.

Transformers Built to Rule toys were predicted by some groups to be big sellers in 2003.[18] A small number of Transformers: Energon Built to Rule sets had a limited, test market release, but the entire line performed poorly, so it was dropped in its entirety in 2004.

There are some significant differences between the Armada and Energon sets, though both are based on the same basic premise. Each Transformers kit is centered on a "Trans-Skeleton", a very simple humanoid body that folds up for vehicle mode without dis-assembly. From there, extra parts are added to the Trans-Skeleton for either mode. For Armada, the Trans-Skeleton was a very broad, flat solid plate with thin, stick-like limbs attached to it, which led to very awkward-looking robot modes. The structure of the Trans-Skeleton was changed for the Energon characters, to a much more solid skeleton with larger, blockier limbs. This led to much more solid, stable and sturdy-looking robot modes.

• Kre-O
• Lego clone