Not looking for a straight-up solve-some-puzzles books or anything (though I'm not opposed to those if they're in actual novels and not just picture books), but rather books like the series in the title that incorporate little mysteries into the story with illustrations and the like, I really enjoyed those books.
Only recommendation I've got so far was Hidden Pictures, which was insufferable due to weirdly promoting a very right-wing, Fox News-style agenda, which made it pretty much impossible for me to finish as it was like listening to my father-in-law try to tell a story, which sucks because it did do the illustrations well.
Already have House of Leaves, which is great, but also a little different than what I'm after.
Strange Buildings isn't out until March and I'm itching for similar books until then!
by Xbob42