The question with toys is what the maker will tell you before you buy. LEGO prints the sets; Pokémon's listing names all nineteen figures; Play-Doh, Barbie, Frozen and Jurassic World say what is in the box and not which door holds it; Schleich's Harry Potter miniatures keep the line-up secret beyond three exclusives. The score follows that, because a calendar whose doors are a secret is a lottery you paid thirty for.

Age is the other question, and the tags on each page carry it. Play-Doh, Playmobil and LEGO City and Friends are the ones for a child under six; Hot Wheels and Frozen sit in the middle; Star Wars and Marvel LEGO, Pokémon, the Funko Pocket Pops and National Geographic's four science kits (gemstones, magic, mega science and outer space, 29.75 to 39.99 USD) are for the older child who collects or builds.