CheatCodes.com has all the official Civilization IV PC cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Civilization IV are shown below.
This is very simple. Press the "esc" key and go to world builder on any level you are on. You'll have two boxes, the one on the top left corner has all units, buildinds and technologies. I suggest you put 3 navy seals next to ever enemy city. Or put ICBMS in your capital and launch them everywhere. You can also delete any unit from the map by right clicking on them. And when you exit, everything done will still be the same. Conquere the world in one turn/year. Napoleon could never do that.
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