While at sea, you can unload a ship on the same square where there is another ship and that ship can take over the load. If you fill the coast of a certain island with units, even non-military, the AI won’t be able to land, thus isn’t able to conquer that island, until it has marines. This way you’ve moved you capitol for free. Your former capitol can be rebuilt by the settler it created. When disbanding your capitol your palace will appear in the biggest other city. Make an agreement of Right of Passage, move your units to their main cities and attack them all at once. The first five exploits listed here are allowed. Green is allowed when playing the Game of the Month (GOTM) red is disallowed. Here is a list of known exploits in Civilization III. The only known cheats are those tricks that exploit some bugs in the game and player-created cheat programs such as trainers and saved game editors. Firaxis also hasn’t released any official cheat codes for Civ3.

Civilization III didn’t come with a built-in cheat mode, unlike Civilization II.

Civilization iii save game editor