www.amazon.com/House-Leaves-Mark-Z-Danielewski/dp/0375420525/
Older book now, early 2000's. Could very well be the inspiration behind all the Backroom Trope for all I know. The book itself is dense, it's laid out in multiple formats with footnotes and interconnected stories. I read it in college.
Amazon actually has a hardcover version right here but I have never heard of or even thought that a book's publishing format would affect how people read it. That's amazing and insane. I think it's time to order this paperback.
I just bought this on Amazon:. You can choose either paperback or hardback. I got the hard back, and it’s a full color 2nd Edition and appears to be complete. I was also nervous about buying it but it worked out.
Not exactly the same thing, but House of Leaves immediately came to my mind.
Ráadásul külön színekkel van kihúzva :) (Ja és van companion book is..)
You want this one:
Not necessarily the one from that particular seller, but one with that style cover
You might be glad to know it does come in hardcover: https://www.amazon.com/House-Leaves-Mark-Z-Danielewski/dp/0375420525/
the fictional story behind it is even better