3D CAD systems enable you to make simple digital objects and combine them into more complex forms. When using a 3D CAD system, you almost always make objects in reference to other objects.

This game aims to help you develop skills in 3D object creation. It does this by asking you to create two highly interrelated objects. It introduces two kinds of commands: primitive object commands and the Boolean commands.

Primitive object commands enable you to make such things as cubes, cones, spheres and torii. The Boolean commands enable you to combine objects by cutting away or adding to existing objects. The commands are not enough. The game introduces four strategies for relating objects to each other efficiently.

• CLICK IN THE CLEAR (select items the in the most simple visual way)
  
• MAKE AND MOVE (make objects in simple locations before moving them to complex ones)
• MOVE BY VECTOR (move objects using "snaps")
  
• VERSION WITH LAYERS (store successive steps in work in different layers)