In Prelude expansion for terraforming mars you are creating the megacorporation which will lead you onto Mars and help in the terraforming that will change history and make your company wealthy. Its a great expansion to this awesome game. Like all the terraforming mars expansions it can be played along with any of the other expansions to this great game in any combination. It will add a distinct flavor to the game and make it a lot of fun for both the new player and the experienced player.