A little post for the moment.
Some of the other books in my collection.With summer vacation in mind, including some for kids.
The Usborn Puzzle Adventure series have puzzles on each page, that need solving before the page can be turned.
There are two series for younger kids ;"Young Puzzles and Young Puzzle Adventures
And one for teens as well:beware of the Advanced Level seriously hard!
King Arhtur :Dragon's Child by M.K.Hume ,which i piked as my summer vacation read last year:
Also Mercenaries by Jack Ludlow ,some of the locations in this were familiar to me the story though was new .