I think kids of all ages (even adults) can enjoy Waldo books, but this one has a definite age range. It is important to note that I think this book is intended for younger children, as older kids would find the games and activities a bit simplistic.
Stickers feature predominately, with six full color pages in the center to use on various pages of activities. The first page instructs the child to "stick the stickers on top of the matching silhouettes to complete the scene." There's a very simple Sudoku page, a reindeer matching game, a two page board game, and one page of finding Waldo and his friends. But 75% of the book is using stickers - both for decorations and as games. I would estimate that sort of activity would be super attractive to a 3 or 4 year old, but a 6 year old might be bored.
I think it would be easy for people to glance at the cover and think "Waldo with santas!" without seeing the additional description of "Puzzles, searches and hundreds of cool stickers" right below the title. I think it's a super activity book for young children, but I would hate to see someone order this for an older child (or themselves) and be disappointed. But if you have a sticker lover, absolutely order this one.
Review copy provided by Candlewick Press.