The Underwood Project (TUP) is a modular, multi-purpose, virtual environment built in the Unity game creation environment. It is designed to enable individuals with little experience of Unity to make fairly complex interactive environments.
TUP contains two main elements:
Kit of parts including stock models, scripts, lights and materials for users to construct their own environments.
A ready-to-use example level.
TUP was modelled in 3DS Max 2017. All of its assets including models, textures, sounds and scripts were designed and built from scratch. TUP was implemented in Unity 5.5 using only standard packages.
If you have never used Unity before, it is a good idea to familiarize yourself with its basic operation before using TUP. The basic Roll-a-Ball tutorial on the Unity website should provide enough information to get started.