What would happen if I skip the last floor on challenge?

[Piterros990]

I'm curious. I have three options, but I might mess up, so I don't want to test. I have Depths II, Dirty Isaac's Bedroom and challenge Head Trauma. I have a good run so I don't want to break it.
My thoughts of what could happen:
1. You'll just go to the next floor;
2. You'll be teleported to the same floor you're in;
3. You'll win the run.
Please, tell me which of these is correct.

[Daemonologist]

I don't know if it's changed since, but originally at least you'd go to the next floor, if that means skipping over the challenge boss then it makes completing the challenge impossible. Similarly with challenges that end at ???/Lamb and you pick the wrong one out of polaroid/negative, you'll get a normal ending rather than completing the challenge once you reach the point that you needed the other one.

[JellyPuff]

Judging by how dailies work, i'd say, the next floor's boss won't have a trapdoor, but another trophy instead.

Example: You're at Depths II and the challenge only goes up to Mom and find an Ehwaz rune and use it, to skip to Womb I. Now the boss at Womb 1 will spawn a trophy, instead of a trapdoor to Womb II.

Another thing, that would confirm this is Hush during challenges; You could fight him on challenges, which go to Mom's Heart/It Lives and he will leave a trophy behind, unless the challenge goes past Womb II, in which case, it will be a beam of light and/or trapdoor.