How do you unlock the Sedna junction?

[Timmy]

Been fine with all the junction requirements up till now. They don't explain how to get the ♥♥♥♥♥♥♥ mods at all just leave you in the dark and expect you to get them. I've run lua missions 6+ times now and I've only seen the room you need to get to ONCE and I wasn't even able to pick up the mod because I got thrown in a game that was midway done.

[Walrus-Sama]

https://www.youtube.com/watch?v=kH-5uu2b7U8

[Tesper]

Every mission on Lua (Except Defense) spawns a Challenge room, just look for them

[Watermelons]

There are several rooms, not just "the room". There are multiple. Look for the blue banners, except for the one room with a giant hole in the wall and a circular hole in the middle, that's just there for decoration.

And yeah, they expect you to use brain to learn and figure out the rooms, none of them are particularly difficult to figure out after a bit of trial and error or experimentation. Oh no how dare they expect you to think.
Not like you even have to think now, since we're quite a while past their release, and there is plenty of recorded information on the internet if you can't figure them out yourself.

[NITRO]

Mobile Defenses have a very good chance of spawning one for each actual defense point. I have actually gotten times where each single one had a challenge room.

Just make sure to bring some of those drones or a few friends, one of the rooms requires four buttons to be stood on at the end although most you can do by yourself it is just easier with more than one person generally.