9. The Hollow Earth Game

In this game the classical vision of Julious Vern of the hollow earth goes one level further.

The earth in this game is hollow (from the 2/3 of the radius till the center)  has internal bluish gaseous sun fixed in its  center, and vegetable and animal life together with an internal atmosphere with clouds sunshine and rains. There are no seasons and stars. The gravitation reverses twice once inside the solid shell (at 5/6 of the radius from the center , and about 1/3 of the radius from the center). There is a large city of 20 million people called Kalipolis or Esopolis . In the outer earth there is another large city called  Exopolis.

There are two openings of about 70 kilometers diameter at the poles , at the bottom of both oceans that link the inner and outer earth through water. Also there are about 12 tunnels of about 2000-3000 kilometers that you can go from the inner to the outer earth through land , through the solid shell. The game is about the interaction , interplay of the two civilizations the inner-earth civilization and the outer earth civilization.

Here is an 3D animation video, which gives the above assumed concept (in the video the width of the shell is shown half of what mentioned here)

http://www.youtube.com/watch?v=ubKFmIDBMjU