A room for an in-game Level Portal.

[Triple J]

Remember the level designer room in Super Mario 63? Good times, but it was almost useless!

How about (since this game will be OpenWorld) adding a room somewhere in the main game, where you could access any user-made levels on the Level Portal found at the Last Legacy website?
Maybe there could also be some kind of warping animation, similar to when you respawn back to a Respawn Point?

Gotta make it interesting!