How To 

The Ultimate Espionage Guide for Civilization 6

Spies can be a powerful tool in Civilization 6, and no nation should forego using them. So how do you use them to help you to achieve victory?

Step 1)Where to send your spies.
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Spies can be sent to any city, including your own to counter enemy spies. The best places to send them would be enemy cities with theater districts that contain great works, or even your own cities with great works to protect them. You can also use them in enemy cities with campus districts or commercial districts to either steal technology or money. Sending them to a city that doesn't have any of these three things isn't going to be that beneficial.

Step 2)Always set up listening posts.
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If you are planning a heist to steal some great works, technology, or money from a city, make sure you gain some sources in the city first. It will greatly increase your chances of success in all future missions done in that city for a certain number of turns.

Step 3)Redeploy your spies as needed.
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If the city your spy is working in is falling behind, or you've stolen all of the great works out of it, then you should move your spy elsewhere where they can be more useful to you. You won't be able to do this while they are undertaking a mission, but once they have finished you can pull them out of the city they're in and send them off to the next target.

You can use spies to keep an eye on what people are doing as well, just by having them in the city you'll gain sight of what is going on around it, as well as notifications of what they are doing.