How does Bee Swarm Quest System works?

Hey gamers!

I'm an advanced scripter from now on and I joined the community recently but i'm scared of writting poor code so that why i'm asking you guys.

I've been wondering how Bee Swarm Quest, let me explain;

For a year now I've been playing B.S.S, and I've been wondering how the quest system save / load, like what's the approach Onett used. He used table for sure, but in which way you think he saves it?

Also, I'm wondering how the script can detect when you collect pollen from a certain field and increment the value of the quest or when you pop a bubble the value gets incremented too?

And my last and final question is how did he make the ability to have multiple task to do like for example; collect 1500 pollen ; then collect 8500 pollen from this field and use that many abilities?

To resume; I'm trying to understand in details how Onett's quest system has been made.

Thanks a lot, Have a nice day!