Questions relating to friends on Airport City.
1. To add a random player open the first tab → press the confirmation button. When the invitation is sent the chosen players go the the waiting list (the second tab) until they accept your invitation.
2. To add a certain person open the friend codes tab and enter your friend's code. Please, note that you can redeem only 5 codes a day.
Some gifts in the game are special and it's necessary to complete certain quests to make them available. These gifts have different requirements to your level of experience.