I have other puzzle books from the Grabarchuk family on my modest Kindle 6". They are entertaining and aim to improve our minds. I have enjoyed them immensely.
I bought this book thinking about my coming long haul trip. Sadly, there is a problem with the book. The images of the puzzles are not rendered properly making it hard to read. Moving the controller up and down the screen instead of selecting the different puzzles it merely zooms into the icons. The links at the top of the menu page, i.e. intro, play, credits, etc. do not work either.
I deleted it from the device, downloaded it to my computer and transferred it but still it does not work.