Civilization IV Beyond the Sword mod Mega-Marathon by Tyr Antilles combined with 40Civs created by Mikel Olson.
TyrMegMa40c (2026.10.04) mod is basically the default Civ4BtS but longer and larger with maximum 34 players instead of 18 and other improvements that do not affect in a bad way the original CIV4 BtS experience.
Download the mod from here:
https://mega.nz/file/FaJAEL4L#fGPumkuW7QobSTd-F2gHPaS-c8GhFOu6PlnuZihP4A0
Download the way I calculated the values for the mod here:
https://mega.nz/file/gKQjxRAT#Oy0ZeQ1mSZAQ3Ht7MJoXvGheXDuz_4b5aSVvnrGuyN0
For hard-core Civilization IV enthusiasts that feel the huge maps of the game are too small and Marathon mode is too fast, I made this mod that offers several things:
1. Six more map sizes larger then the Huge map of the original Civ4BtS. I will list all sizes, the first six of the original game and other 6 available on TyrMegMa40c mod:
* original Civ4BtS WORLDSIZE_DUEL: size = 10x6
* original Civ4BtS WORLDSIZE_TINY: size = 13x8
* original Civ4BtS WORLDSIZE_SMALL: size = 16x10
* original Civ4BtS WORLDSIZE_STANDARD: size = 21x13
* original Civ4BtS WORLDSIZE_LARGE: size = 26x16
* original Civ4BtS WORLDSIZE_HUGE: size = 32x20
* modified TyrMegMa40c WORLDSIZE_DUEL: size = 38x24
* modified TyrMegMa40c WORLDSIZE_TINY: size = 45x29
* modified TyrMegMa40c WORLDSIZE_SMALL: size = 52x34
* modified TyrMegMa40c WORLDSIZE_STANDARD: size = 60x39
* modified TyrMegMa40c WORLDSIZE_LARGE: size = 69x44
* modified TyrMegMa40c WORLDSIZE_HUGE: size = 78x50
2. Four more game speeds all slower then the Marathon speed from the original Civ4BtS.
* original MARATHON: 1500 turns
* modified TyrMegMa40c QUICK: 2250 turns
* modified TyrMegMa40c NORMAL: 3000 turns
* modified TyrMegMa40c EPIC: 4500 turns
* modified TyrMegMa40c MARATHON: 9000 turns
For all of these, game speed, tech discovery, construction and others are a lot slower giving enough time to play every age a lot.
3. Adding on top of it the CvGameCoreDLL.dll that is 40Civs mod, the world can be filled with max 34 starting civilizations and 6 colonies, instead of 18 civs that were allowed in the default game. This make the huge map really lively with a lot of civilizations competing with each other.
4. Replaced global warming desert terrain with fallout instead by 40Civs mod.
(infos about 40Civs mod by Mikel Olson here: https://forums.civfanatics.com/threads/bts-40-civs-allows-colonies-and-34-civs.234779/)
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Start of the mod:
1. - Close Civ4 if is open
2. - Unpack TyrMegMa40c.zip to Civ4BtS mods folder:
* for STEAM version of Civ4BtS, Mods folder is: {the place where your STEAM folder is located}\Steam\steamapps\common\Sid Meier's Civilization IV Beyond the Sword\Beyond the Sword\Mods\
* for the standalone installation of the game (if you installed on the default path) Mods folder is: C:\Program Files\Firaxis Games\Civilization4\Beyond the Sword\Mods\
3. - Clear the cache from Civ4 cache folder - just delete all files inside cache folder from c:\Users\{your win user}\AppData\Local\My Games\beyond the sword\cache\
4. - Fire up Civ4BtS and launch the mod from Advanced > Load a mod > TyrMegMa40c
The game will restart loading the mod. In upper right corner will be written the name of the mod: TyrMegMa40c
5. - At the beginning of the game choose:
* Custom game.
* Map type (Archipelago works best, but other types can be suitable. You can check how a new map is generated by entering the map editor, then restarting a new game with that map type.)
* Size: all sizes are progressively bigger then the original HUGE.
* Speed: all speeds are progressively slower then the original MARATHON.
* Deselect Victory: Time victory (To not have the game end just when things start to become interesting.)
* Manually add up to maximum 34 players.
* The other choices are optional.
Required to finish such a game: a strong computer and a TON of patience and free time.
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Edit the file: c:\Users\{your win user}\Documents\My Games\beyond the sword\CivilizationIV.ini
to suit your needs.
I modified these lines:
; The maximum number of autosaves kept in the directory before being deleted.
MaxAutoSaves = 20
; Specify the number of turns between autoSaves. 0 means no autosave.
AutoSaveInterval = 10
; Determines which user profile is loaded on game start
UserProfile = Tyr Antilles
; Specify a Mod folder (Mods\Mesopotamia), '0' for none
Mod = Mods\TyrMegMa40c\
; Custom Screen Height, minimum: 768 - Normal resolutions can be set in-game and will be used when set to 0
ScreenHeight = 1022
; Custom Screen Width, minimum: 1024 - Normal resolutions can be set in-game and will be used when set to 0
ScreenWidth = 1918
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Screenshots
1. Game on turn 2167 on year 1931 AD. Notice the size of the game window on the mini-map on the bottom-right corner of the screen. That big the map is.
2. The crowded relations screen.
3. The big planet. This complexity if what makes this mod so wonderful.
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This update and replaces the older post from here:
https://tyrantilles.blogspot.com/2020/08/20200829civilization-iv-beyond-sword.html
