Features:

The Spy disguises himself as another player's worker and can freely pass his gate if they are in auto mode.
In terms of characteristics and appearance, it almost does not differ from the worker, the only difference is that the spy does not have an ax.
Just like a worker, a spy can build a campfire anywhere, even if there is no hub nearby.
In addition, spies can attack peaceful players without declaring war, while the attacker does not receive the status of a criminal. However, spies themselves can also be attacked, even those belonging to a peaceful player, and this is not considered a crime.
As long as the enemy spy is not revealed, your units will not automatically attack him, he will be displayed in green on the screen, as if it were your unit.
As soon as the spy attacks someone, enters the radius of view of a campfire or streetlght, leaves a building or ship, his stealthiness disappears for 1 minute and his color turns red, even if his owner is a peaceful player.
If you select a disguised spy, it also turns red.
You can train a spy at the university.