Parse Value from Puzzles to the project code

Hi,
I think this is a rather simple problem but i did not figure out how to do it.

I want to use some jquery elements for my project. Maybe this can also be entirely integrated into puzzles?
But here is what I try to do:
I create a variable via puzzles, say “boolean_x” and set it to false
On a specific event in the puzzle script it turns true and then an individual script shall be started. That is why I want to call the variable in my project script like “if v3d.puzzles.boolean_x == true” or ” “if v3d.puzzles.variables.boolean_x == true“? Those syntax don’t work.

Thank you in advance!