Mars Global Surveyor

Sometimes stupid ideas create good expansion. I was coming back from Ludovic Gimet's association with a defeat at Age of Steam in the Netherlands (not John Bohrer's expansion, but one of mine not yet published).
As you probably know, he always plays the green color.. green color, green color... fed up with green color... 
How to forbid the use of green discs ? Just transform them in goods or... in Martians.
As i was testing my Moon expansion with many problems of building and balancing around the map, i thought to a Mars expansion, with martians living in cities. If i added a new color of cube (green) i should put off one color. I chose the red one because the planet is red, simple!
On the moon , the wrapping is restrictive and efficient ony with North-South. I would like to create a more noteable wrapping. As i am fond of Sci Fi, i imagined 4 players that could land on definite hexes as starting base when we will colonize Mars in 20 years...
So i created 4 starting hexes with a bid for them. A spatial vessel will land on Mars with cubes, and take off after the first turn. Then the networks should be continuous. 

Green discs are the martians and confered when they are present a new color for the city on it :green. If we apply the basic rule, Martians will meet martians. It could be counted as victory points at the end of the game.

To regenerate the martians' disparition, everybody knows that Mars had water on it, but it is very rare. So i imagined that when a blue cube arrives in a blue city, a martian births and can be moved as a normal cube.

The size of the map never varied and i designed it to be the bigger than it could be printed by my publisher, i just canceled some hexes in the North and in the South like in the moon
This map is suitable for 4 players and only four since the beginning of the development. I think it can be played with 3 players, but it has never been tested (I don't know why !)

After many tests, i realized that Engineer should be a little bit more attractive to reduce the power of locomotive actions and the urbanization actions. Notice that the Blue New city is very strategic and should be used with attention because of creating the second and the last blue city. So engineer will build at half cost.
With the Blue capital Marsopolis in the center of the map, games tend to be a rush to this city . This rush is increased by 4 number on the city and potentialy 12 cubes could arrive.

When Ludibay contacted me to reprint the Moon, i added the Olympus Mons. A vulcano of 30000m high can not be crossed by train even with US Engineer !