Like Cup%, but with the companion cube from chamber 17. A guide on how to do this can be found here:

First of all, sorry for being a little too late, we do respond earlier if the request is done on the thread made specifically for so: https://www.speedrun.com/portal_category_extensions/thread/3tiqf/4 .

The main issue I see with this category would be that, firstly, a great amount of the would be just regular oob and from 17 on it would be like 24 cubes but just with one, which makes it incredibly similar to two already existing categories, which is, in itself, a rules. We also do not allow runs that do not start on the vault, with some excepcions for obvious reasons.

If you do still want to push this further, make sure to rethink your request and post in on the thread above making sure it does not go against any of the rules noted on this thread: https://www.speedrun.com/portal_category_extensions/thread/zzd25 .

We appreciate your particiation by submitting runs and we expect to see more from you.