Each player has a pair of 3x3 size Princess Towers on their respective side of the map, one on the left and one on the right of the King's Tower.
Destroying an opposing Princess Tower awards you a Crown, and grants you additional territory across the river where cards can be cast upon.
The level of your Towers is equivalent to your King Level.
The Princess Tower's hitpoints and damage are increased by roughly +8% per level from levels 1 to 9 and roughly +10% per level from levels 10 to 13.
Since card damage and health increases by +10% per level, maxed level 13/11/8/5 gameplay is practically identical to maxed level 9/7/4/1 tournament gameplay (only the two Spells that increase by time, Rage and Freeze, and the Lumberjack who drops the Rage, are truly stronger at higher levels). At lower levels Princess Towers are slightly stronger compared to cards.
For example, a Princess Tower will kill a same level Knight in 14 shots at levels 1-3, 15 shots at levels 4-7, and 16 shots at levels 8-13. A level 1 Rocket will take 17.2% of the health of a level 3 Princess Tower while a maxed Rocket will take 19.5% of the health of a maxed Princess Tower.
The Princess Tower is a ranged tower that deals damage to opposing troops and can attack both air and ground units.
However, they have decreased range versus a normal Princess, have a faster hit speed, deal less damage, and don't have splash damage as they don't appear to have multiple arrows when shot. It is possible that the Princesses on the Princess Towers deal less damage than normal Princesses because their arrows aren't on fire.
Before the November 2016 update, they had a different appearance than the Princess.
The November Update slightly modified the shooting animation of the Princess atop the Princess Tower. The animation now appears smoother and the Princess now leans backward more clearly before shooting. The appearance also changed so now it looks like a normal Princess.
There were previously named Arena Towers. The June 2017 Update renamed them to Princess Towers.