How to make Script puzzles?

[HumiliatioN]

If you want the book puzzle you should use LocalVariables, i.e;

When the player pulls the first book, the localvariable sets to 1(add a timer to remove it after 10 seconds or whatever), and when he pulls the second, the localvariable turn to two etcetc

Firstly, you should make an area where the function will happen for all the books(when the book touches this area it begins to get higher variables)

So when the first book touches ScriptArea_1, you add a localvariable, and when the second book touches ScriptArea_2, you add another localvariable, and when the variables are at a certain number (let's say three), a function happens which moves the shelf.

Can you show me example how to do it in code?

I'm confused :I