The ISIS I Puzzle & Adventure, Mike Verdugt, Press release - PresseBox
Isis ball - the most difficult puzzle of all-time - Tech Digest
Puzzling in wonderlands: Isis puzzle
Stefan on Twitter: "Got an Isis Adventure puzzle sphere on my bday. Super cool! Yes, I solved it :-) http://t.co/PqymECRYPX #cryptography http://t.co/pOboFaPonk" / Twitter
ISIS Puzzle und Abenteur, Mike Verdugt, Pressemitteilung - PresseBox
Special Edition Titanium & Blue Isis Puzzle - YouTube