We would like to bring your attention to the description of the map mode.
In the map mode the player sees all his or her towers and towers of the friends, the player can collect crystals from his or her non-battle towers and towers of the friends, no matter how far away the player is from the tower. The map mode is available to all players from the first level. Every collection from the friend’s tower brings a small amount of crystals; also the owner of this tower is charged an increased amount of crystals for this tower. But the number of clicks you can make is limited.