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I've noticed in some levels, there are blocks and enemies that are walk-through, (I've noticed walk-through enemies next to a sign, allowing you to "talk" to them) I wanted to know how to do this, could someone help me out?

Basically people are just disabling items. All you have to do is find the item you want to disable in the code (you can search for it once you know the ID, or you could just do what I do where when you want to disable something, you place it and immediately disable it there and then because when you look in the code, it'll be the very last item in the code) and then you just place a 0 in front of the number. E.g. disabling a shine sprite, it's item ID is 6, so you'd look for a |6 followed by some other numbers in the code, and you just make it |06.

I'm no good at being concise, sorry. But I hope this helps.

You should take a look at the Tutorial Thread. This also includes some more tricks and knowledge.

Disabling can be used for many interesting effects, not only for "talking" to boos or other enemies, but especially if you want to add some Shine Sprites only for visual effects. Even if the player can't get them, they have to be disabled if there are red coins or silver stars in the level. Also, silver stars start to glow like Shine Sprites if they are disabled.

There's also a trick how to put more words into a sign, if you need that:

http://runouw.com/forums/viewtopic.php?f=15&t=46850#p300673

Hey, thanks guys! this really helps!