Thanks so much for your help.

The reason that I'm not using the path movement is because I'm trying to create a game for a camp to teach kids in three hours. The path movement is far too complicated. But this new version seems to be far more stable.

Here's what I have. I hope you see something that I can't.

http://www.box.net/shared/49qk8tfk7e

I've tried that, but it still zooms right through the walls.

I've just switched the enemy movement to ball movement. It fixed the problem, except now it will randomly go through the walls. It will hit several and then go through, or sometimes it will go through the first one. I tried it both with solid and non solid attributes on the enemy object, but that doesn't seem to effect it. I'm so close!!!

I'm sorry, I guess I wasn't clear enough. What I need the enemy characters to do is simply not go through the walls. I built mine similarly to the Ghost Shooter tutorial, where they hit something and then rotate towards the player. Does this simply overwrite the "solid" function? Because the enemy characters are really flying thorugh the walls.

Ok, I'm going to try to be as clear as possible.

I'm basically making a game like Gauntlet.

I have my enemies spawning at spawn points, they have bullet behaviors on them so that they will aim towards the player. However, once they hit a wall (I have it set so that when they hit them, they rotate towards the player) they fly towards the player, regardless of what's in the way including the solid walls. How do I prevent them from doing so? How do I make them recognize that the wall is there, and that they need to go around it to get to the player?