An escape room you can do at the kitchen table: riddles that unlock the next page, and an answer key you are not supposed to open. Journal 29 and the EXIT books are the usual way in.
A book with something real hidden behind it - Kit Williams buried a golden hare and painted the directions into Masquerade; people are still digging for later ones.
One murder, a grid of suspects, weapons and locations, and just enough clues to eliminate everything but the answer. There are hundreds, in books and one a day online.
Cover to cover, not the two you do on a train: a book of nonograms, sudoku, kakuro or logic grids, finished to the last page.
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