The demo is a cut down version of the full game, with the following retstrictions:
* It allows you to play for 30 turns only (2.5 years of gameplay)
* No load/save included
* Multiplayer not available in demo
* 3 tutorial missions & 1 quickstart mission. 8 main game missions are disabled for the demo, but you can query them to find out more info about them
* Limited number of units & buildings available
* Limited number of playable ethnic groups