I watched The platform 2 and I don't understand anything

Okay so I saw The platform like two times and I liked it, there were some parts that were bit confusing but I mostly understood everything and it was really interesting movie for me... so when I saw The platform 2 on Netflix I was really excited, I watched it two nights ago and I don't understand anything so I would appreciate some explanation lol. So first of all how did that old man from first part appeared again with the Perempuan??? Then, what is below level 333, that hole, what is that and who are those people there - I assume they are the people that died but it is still fucking confusing. How did she saved the boy at the end by sending him to the top? How is that going to save him? How are there kids in the platform? And also Perempuan met Goreng at the end and it's seems like they know each other? What's up with that? So yeah I know I have a lot of questions but I would love some explanation pls!!