I found a YouTube channel called, "Suede CivIII." A great deal of fine basic info, and also quite a bit about multiplayer games. Some look as though they have some interesting twists which might be fun in solo play.
They're crazy people, swapping copies of files on random Google Drives and reposting the urls on Discord whenever someone asks for them.
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I understood @Ozymandias was referring specifically to the .biq used by @SuedecivIII and his MP-team for the multiplayer games he's been streaming on YouTube for *checks upload-dates* the past couple of years.Ozy, every biq can be played as a multiplayer biq by starting the game as a multiplayer game. There is nothing special in these biqs.
Join the civ3 players league group on steam and there's a link to this drive: https://drive.google.com/drive/u/0/mobile/folders/1OBGCcd_kfkK-gNyRarw3AejA9tW2ZBGw?usp=drive_open