The implementation of the AR capabilities in Unity is done through the Vuforia AR kit, enabling the tracking of 3D elements in the real world using your device camera and the generated QR images to assign the game elements (One for the catapult and another one for the objective).

 

The main objective of the player is quite simple, try to take down all the structures in the objective within all the available projectiles.
 

For this task the player can move the catpult QR card to aim it in the desired direction and distance from the objective.

Then the catapult needs to charge, this is done by mantaining pressed the screen. The more you press, the more it'll charge and the further you'll shoot.