Need help understanding a tutorial

I was able to find a Legend of Zelda style movement tutorial here:

scirra.com/tutorials/297/zelda-style-moviment/page-1

Which also includes the downloadable for the tutorial but I really have a hard time understanding it.

I have a couple different questions about it currently.

Is there any reason why the creator would add all of the different objects he uses on the outside of the layout? Is that so the other sprites can use them, or does that help with loading?

And, when you capture the key in the downloadable, and travel through the door, it essentially moves you to another part of the layout, since each and every room is within that layout. How do you do that?

I'm not able to understand the tutorial provided unfortunately, and really can't seem to find a tutorial online anywhere.

Thanks for any help!

Wow, that's a really bad "tutorial". It isn't even commented.

Anyway;

1. Construct 2 can't create objects if there's no instance of them anywhere on the project, that's why he probably put them out of the layout. Putting them there doesn't affect performance or anything, it just helps to make the layout more "clean".

2. About the door you've mentioned, it took me a while but I found the code. If you go to the right of your screen, click on the "project" tab, and open the event sheets directory, there are two event sheets.

<img src="http://i.imgur.com/4srvMw0.png" border="0" />

He basically creates a black square, makes it the size of the layout, starts fading it, and when it's done it sets Link's position to the room.

This is a really really REALLY bad tutorial to learn from, so please avoid it. The programming on how you move Link around is really... different.

Cheers!