Advice on hiding spoilers for a wiki

Hey, all! I’ve got ACF pro, and I have my back end all built, I’m just trying to come up with the best way to display the information.

Basically, I’m an author who’s trying to make a character wiki for my series. I’ve got a lot of repeater fields and conditionals, so that some details of a character shouldn’t appear if the user hasn’t read certain books yet.

I think I’d like for the page to load with a dropdown to ask what’s the last book the user has completed (or if they want all the spoilers). Then the page will display data based on that input.

I’m not entirely sure how to do the dropdown yet (maybe a modal?), or whether I want this conditional display to be just simple CSS to display:none, or full-out database querying stuff (probably overkill).

Anyway, I was just wondering if anyone had any advice as to how they might hide certain values and show others based off user input of how much they want to see.

Thanks in advance!