So how exactly do I get the last request?

[Albion Hero]

I've heard theres supposed to a level that pops up near the Casino after beating the game... but I've beaten the game and the only thing that pops up in that area is some music thing that makes all the cousins dance. I've beatne the supergiant level 3 times now to see if that unlocks it, yet still nothing. Anyone know anything else to try to get that Uranus level to open?

[Lucent Beam]

It's possible to beat Schloss Cosmos without having completed every other mission, I believe. Go around and make sure you've already beaten every level. The last level will appear when every other request has been done.

[Albion Hero]

Yeah, I've beaten every mission... in normal and timed. Once I beat the uranus mission ill unlock both the request and completionist ones... Plus I've got like 85% of the collection, so its pretty frustrating not being able to open up this level so i cant get the full 100% completion either -.-