I have a question again.
When I editing w6, I saw a strange thing:
Unused cannon(w6 to w8)
How can I use it?
Do I need add a secret exit in a level or use ASM hack?
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It's an unused level. As far as I know, there's no way to get to it. It's not in the world map.

You could access it either importing it to another level (which is kinda pointless) OR using the "area overflow bug", which I don't remember exactly how it works.

You just have to write into "Destination Area", the area you want.
For example:
-You are in W1-1 Area 1.
-You make a warp to level sprite there.



And so on....

You can always access your "home area", by making Destination Area the value 0.

I wonder, could that overflow bug be used to access an area that its after the level? Lets say to have level 5-1 to take you to 1-1?
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Well if your home area is 1-1, then yes. Otherwise, no because I don't think you can put in a negative area. So whatever area you start in, you can enter any area that is after it.

To answer you question unknown object, there's possibly 2, but definitely 1:
1. (Sure) Do an area overflow
2. (Unsure) Add another level marker to the overworld.

I wonder if by putting a large value will loop back to 1-1?
Or maybe it will crash...


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Crash.
I've tried it before.
Now: