Why some players have their nicks colored green, red, white or blue (violet)?
“Green” players are protected by “newb protection” so you can’t attack or espionage them. “Red” players are too strong for you – they see you as “green”. “White” players are on your level, you can attack and espionage them. “Blue (violet)” players have Vacation Mode turned on, you can’t espionage or attack them.