YOU WILL NEED:

Embedded Collision Detectors.mfa
This mfa contains all the objects you will need for this tutorial. Apart from the objects, frame 1 is empty, while frame 2 includes the finished code. Download here.

Enemy (Active Object)
This is our enemy object. It contains 3 embedded detectors stored as 3 different animation sequences. We will switch between these animations testing for collisions with obstacles..

Various Obstacles (Backdrop and Active Objects)
The level is made up with from various blocks which our enemy objects will collide with. Some are active objects, while others are backdrop objects.