In my idea about level 999, the only thing I could think of is basically a highly unstable but safe dimension where basically all physics and dimensional objects are basically manipulated into oblivion. 3 dimensional forms exist here as usual, but new dimensional forms would also exist here that can come in any form which doesn't exist within our real universe. You can also see your memories come to life within this place as if there real either.
That's it for me really, goodbye.