Operation Manual To create some 'your' own obstacle ! 1: New a class and extends to the abstract class 'Obstacle'. 2: Initialises the constructor of this class. 3: Load the corresponding images in the MultiUseImages class. 4: In the randomCreateObstacle of Room class, add logic to add the corresponding obstacles to the ArrayList obs. 5: In the drawObstacle of Manager class, add logic to print the images(like HardObstacle) or frame animation(like Grass).