Okay, so you've started making a Flash CS4 gam. You've got a character that walks around. Where is he going to go?
This video will teach you how to create Pacman-style level boundaries using Actionscript 3 and Flash CS4. This means that whenever your character walks off the edge of the screen, they will reappear walking in from the other side. This is a very easy condition to create, and will get your game a lot further along it's way to being playable.