Before I reply to all new posts, let me make an announcement. The development of Extra is coming to an end. The way I see it, almost all usable content - that doesn't affect the core gameplay too much - from the official Firaxis mods has been used and implemented.
Right now I am working on the final version. All existing bugs must be fixed in this version, plus a few more features will be added. For example, the Olympic Park from Rhye's and Fall (BtS), the Makurian/Nubian civ from Crossroads of the World (BtS) and some new technologies. There are still some things in the official mods that seem really interesting, but which I'm still having my doubts about. I'm leaving them up to debate. Input or advice would be appreciated.
A. For example, the 'hero' unit in Alexander's Conquests (Warlords). Should a hero unit be added, and if so, in what way?
B. Same with the Mongol Camp from Genghis Khan (Warlords). Could/should it be implemented?
C. The Greek Fire promotion from Genghis Khan (Warlords). Could it's effect (1 free strike I believe) be replaced with something else to make the promotion more original?
Also, I'm open for other suggestions of course. I ask of all Extra fans to take another good look at all
official Vanilla/Warlords/BtS mods and see if there are still noteworthy features in there that haven't added to Extra yet.
When it's finished, this version will be the "core" version. I've already given some hints about what I will do afterwards. My plan is to make a number of add-ons for Extra. These add-ons will
not neccessarily consist of firaxis stuff. Yet they will all have the same aim as the original Extra: adding extra content without altering or unbalancing the core gameplay too much.
I understand that some people would rather keep Extra in it's clean form (devoid of as any non-Firaxis content as possible) -- and that's what the next and final version of the "core" Extra will give them. It will be up to each player to decide whether to install a certain add-on or not.
The new add-ons will most likely have content like new leaders, new civilizations, new technologies (a Stone Age has been suggested), new buildings, new units, new civics etc. However, take note that I will never just randomly add 'stuff'. Every add-on will have it's own 'goals' and I will be very selective in adding content. Neither will I just 'merge' full mods or anything (I'll leave that task to others). I will always take small bits and put them together in my own way. The first thing I'm going to do is compile a pack of additional civs and leaders. More information about this will come soon.
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@Lachlan (1): I have no idea what "Play now" exactly does since I've never used that feature myself. Is there some file/script that 'decides' how your game will look like? In that case, I could edit that file so it takes the new resources into account

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@monkeyboobs: You're welcome. As for the ice age/stone age thing.. Well, something that goes that far beyond official content couldn't be added to the 'base' Extra. It is however very likely that an 'expanded past' and an 'expanded future' will find their way to Extra in one of the optional 'patches' that I will release in the future. About volcanos.. well, technically FfH: Age of Ice is an officially recognized mod, and it features volcanos next to mountains. If you like, I could add this volcano terrain type just to add some variety to the surface of the world map.
@Lachlan (2): Please elaborate on where you found these wonder stars. It seems like a nice idea to have some Future Era projects or wonders involving space.
@PreLynMax: About the High Walls... After testing it seemed that the High Wall were just too overpowered. You could barely take a city with High Walls. In any case, I would have to remove the additional bombardment bonus that it gives. Only then could I make them available to all cities. Still, I like the idea of players having to make the choice which city they want to give some extra defense. What do you think?
@CHEESE!: As soon as possible, I'm going to replace the version log at the first post with a complete feature list. The version history will be available in a readme text file.