This is a fairly quick and well-designed banner with each mission following on from the previous. It does have quite a few waypoints so if you're after the most unique hacks for your time this might not be the one for you, but the wolf is so lovely... Go on! Time taken: 1hr - 1.5hr.
PS. At the time of writing ingressmosaik said there was a passphrase, but there was none.
I did this on bike, but I ended up carrying it up some steps at some point. There was also some distance between some of the portals, which I imagine is no fun at all on foot. Watch out for the passphrases for the next mission at the end of each mission.