Proving Grounds

Notes

You can't kill a Little Sister and call them out of a vent further down the line. They will only come out vents that one of them has already reached, so a speed run should include no Little Sister deaths.

You don't have to kill the Big Daddy that attacks you. If you pull him back to the security camera and use Security Bullseye, he should be too busy dealing with bots and you can just continue on.

ExplodingCabbage was speculating that you could get to the first floor from the mezzanine at the beginning by freezing opponents and stepping on them, over the invisible barriers. Don't know what became of that.