I never understood why instead of finishing the story mode by beating Klungo 3, doing the quiz game and beating Hag 1 as normal, you replay Hag 1 directly skipping the final part. Is there a particular reason?
So in 100% the definition is to collect everything in the totals screen and defeat Hag 1 as its the final boss. We dont actually fight Hag 1 from the replay menu although it may look like that. We use a trick called DCW to warp to Hag 1 so we can beat it. Selecting Hag 1 on the replay menu is only done so the Hag 1 cutscene plays, but then we quit out right after. After we quit out we go into our run file and warp to Hag 1 from there to beat the boss. This means that the boss is defeated on our run file as opposed to only being defeated on the replay menu. This trick is called DCW and you can read about it more in this pastebin: https://pastebin.com/Cw5YQWzi
The placement of Hag 1 is in the middle of the run just for convenience. It can be done anywhere during the run but we just place it where we do because it makes most sense from a routing perspective, it also allows us to refil on eggs during the fight so we can use them for the rest of the run. The run just doesnt end there because there are still more things to collect as per the 100% definition. So after Hag 1 is beaten all thats left is to complete the totals screen to satisfy the requirements and then the run is considered finished.
Hope this brings some clarification =]
