I've heard good things about Loke's previous battle mats campaign, and I like the art a little better on this one. This is their fifth KS.
It's a set of *two* 30-page books that you can align as you wish, for about under $40 USD, including shipping, to USA. Each page is wipe-clean.
"Each Book is 1-foot square (12" by 12"), so a one page RPG mat is 1'x1' (you can use individual pages thanks to the 360° spine which allows the book to fold in half). Open the Book out to a 2 page spread and you have a 2'x1' playing area (the 360° spine allows the book to lay dead flat). Open two books and they sit flush next to each other (you can even adjust the heights to match again thanks to the 360° spine) and you have a 2'x2' playing area. Or you can form a 4'x1'. Or you can line them up any way you like! The flexibility of this system is unparalleled!
"The Dungeon is a standalone set, it is also fully compatible with our existing books so you can use them together.
"Yes the pages in each book are different. For the more themed rooms we are doing 4 linked pages (2 per book) of each. Obviously everything lines up with everything anyway so you can transition through however you want but we want to make sure for example that you can get a full spread from "the library". Hope this helps!
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Review of their previous Battle Book, which is also available in the KS. IMO, The art wasn't as good, but it's compatible with their books, although the page size is larger. A review said it's too big and floppy for transport.
YouTube link