You have to buy a minimum of 3 boxes and spend a lot of time thinking to make "LEGO 10261 looping" but with succes.
It was great fun to build but I had several diffiuculties to deal with. speed, forces and buildingtechniecs.
I am sorry but I can not uplaod foto's because of the 5MB restriction.
For sure it is the most challeging set ever and we will see a lot of MOC's in the future based on this set, thats for sure. I hope LEGO will stay to the color red as far as extensions wil be produced.
You can find my MOC on the internet and see for yoursel that the looping is working.
Again I have to say that Englisch is not my native language. So sorry for the mistakes.