I've read several books for the upper elementary age group that have puzzles interwoven through the story: Gollywhopper Games by Jody Feldman and the Winston Breen books by Eric Berlin. My students enjoy them.
Escape from Mr. Lemoncello's Library is in the same category. Luigi Lemoncello remodels and reopens the town library and invites twelve kids to a sleepover party at the library. So begins a contest to find the way out of the library.
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