3D Construction Kit II takes advantage of the refined Freescape III engine for its 3D graphics. Compared to the original, 3D Construction Kit II has double the number of controls and commands for added complexity and flexibility. Transparent objects can be created and ones that fade over time. The game supports rounded objects such as "flexicubes" and spheres, which were not possible in the original 3D Construction Kit. This feature is emphasised in the modified cover art.
The sound effects editor is improved, allowing players to add sounds and music to their virtual creations. The program comes with a library of predesigned 3D "clipart" aimed at novice users who may not know how to create more complex structures themselves.[13]
As in the previous version game files may be compiled into stand-alone programs that can be run independently of the editor.
Like the original 3D Construction Kit, the program came packaged with a tutorial on VHSvideo cassette.[14]