I've posted a new walkthrough which should be clearer. That might help you out in general.
The spiders: Add seven and ignore the decimal digit (1->8, 9->{1}6, etc...)
thank you very much I appreciate ❤️
And how i can get this walkthrough?
It is linked in the main post: https://yv0751.itch.io/the-princess-and-the-tower