(Request) Specific Items for a Game Mode

[coolguy69]

Could you specify on what you're confused about? There's a slight chance I can help because I've changed item probabilities before.

Definitely!

https://ibb.co/Zpsbgbsg

This is what I'm seeing... to me, it's a bunch of code. I realize it means something, but have no idea what it means, how to decode, what I would change it to, etc. I'm pretty new to this.