Hi, I am trying to make a custom boss type thing, but I'm having problems with getting the door to appear!
If I start the zone empty then the event activates, but it wont work if I put sprites in the zone.

Broken Area.nml

You have to set "Enemy Zone ID" to 255
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Super Mario Castle 2 | Full release

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When I do that, the door instantly appears. Help?

You are gonna make a boss room where the door appears when all enemies are defeated right? I get your idea.

There shouldn't be any problems as I see, maybe try rebuilding the level again? Also, I'm not sure if the lava or spawned bob-ombs could cause the problem.
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Hmm...
Set "Mario Zone ID" to 255 and "Enemy Zone ID" to 0. That should work.
If you set this than the door will appear if no sprites are in the zone.
_________________________
Super Mario Bros. - The New Worlds | Full release
Super Mario Castle 2 | Full release

My Youtube channel
Best friends forever

In theory Arceus' idea would work, in practice this get a lot more complicated.

See that would work if when an enemy fall in the lava, it get defeated instantly so it works for example with Goombas, Koopa (Para)Troopas, Spinies, Buzzy Beetles, etc.

But some other foes simply fall through the lava (that is without taking any damage), for example Non-pipe Piranha Plants!

And because of that the sprite 168 doesn't count those enemies as defeated, with the exception of Snailicorns.
By no means this means that those foes are unbeatable, simply that you have to beat them the old fashioned way (Fire flower, Starman).

An alternative would be to K.O. those Fire Piranha Plants with the Bob-Ombs, but alas turns out that while regular/giant Piranha Plants get defeated by those, Fire Piranha Plants don't!


That's as close as you can get without heavily tweaking your level.


Settings:
Sprite 122 instead of sprite 124
Sound set: 37 (55 in decimal)
Sprite sets : 1-1, 5-1, 6-6, 10-3

Oh, ok. Thanks everyone ! I will try what you said later, Sharks .