Every scene in this one happens at night, which is the trick. The pages are dark, and the only way through them is the magic slider tucked into the book: pull it across a spread and a beam of light travels with it, revealing one small patch of a Christmas Eve scene absolutely swarming with Santas.

That single mechanic changes how the book gets read. Instead of scanning a bright page, a child hunts in the dark, and the found moment lands harder every time. Martin Handford has hidden the usual crew in there too, so Waldo, Wenda, Odlaw, Wizard Whitebeard and Woof are all somewhere in the crowd, along with very particular Santas: the one with the threadbare stocking, the ones who are slimmer than the rest.

Puzzles and games run alongside the searches. It buys hours, and it is the rare Christmas book that adults end up hogging.