Hello,
I'm new to this particular game's editor and wonder how the castle flipping effect works in that world 8 castle where the switches flip the castle. Clicking on the switch within the editor, I don't see anything about it that indicates castle flipping; I can see that they're connected to some kind of event, but looking at the events list didn't say anything about flipping either. Making a level from scratch, how would I recreate the castle flipping effect? Thanks, if anyone can answer this (Again, I'm totally new to this editor so I'm sure I'm missing something)

I think it has to do with the level itself. If you export the level in the editor, you can then import it onto a different level to have the flip effect in any level.
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Hmm, I hope that's not the case. I made a list of things that'd be interesting to play around with for a custom NSMB level while watching a playthrough of NSMB, and if there are features which can only work for a single level that's been exported/imported, then that means I can't combine them with other features of that sort because those are different levels.

It may very well be a hardcoded event activated by the switch that's been specifically programmed for 8-FC. However, check all of the spritedatas of the sprites in the area that the room is in, and there may be a sprite that does it.
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I'm pretty sure you can use the flipping effect in custom levels. It's been done in More Super Mario Bras. 1 and 2.
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There is special data in the level file for it and you need to set up the views and tiles correctly, but it is not limited to World 8-Castle.