Dr. Gareth Moore 
Jungle Puzzles [PDF ebook] 

Oh no! You’ve fallen from your mountain path, and now you’re lost in the rain forest! You must solve a chain of puzzles to plot your escape route. Devised by an expert on brain training, these mental gymnastics will help you uncover the secret of the jungle temple! You can’t skip a challenge, but there are hints to help and full answers to get you on your way.