I think of this as not a book, but a little series, say four books. It could be a minor Canadian institution.

Different geography, language, and don't forget types of treasure hunt. This diversity business is multifacted, but for now I'll point out that the all-Canadian thing is a selling point, a reason to get buzz.

The name is Thesaurus Canada. Thesaurus is the Latin word for treasure. That might be an unhelpful title, particularly on the spine of the book.

French would be more than welcome. Even the cover of the book would be in two languages. The title works in both languages.

The goal is to get the book published by a publishing company, with an editor. Will there be an e-book? That's up to the publisher. Self publishing is deprecated, but .. we'll see. Financing is a factor. What about making the treasure hunts a website instead of a book? Count me out.