It's common Final Fantasy geek knowledge, man. Yes, I actually completed not only an NSG game but an NSGIE game which rules out equipment swapping also. Hey, I'm just saying things like they are. If you proposed, say, a guide for what you're considering a challenege in this thread, you would be laughed at. It just doesn't really meet the criteria for what people consider a Final Fantasy challenege.

Tons of people beside myself have completed the No Sphere Grid challenege in Final Fantasy X, there is guides for it everywhere. This wasn't even close to the hardest challenege I've completed, The Final Fantasy IX Level 1 Ozma challenege was much harder, as was the Low-Level Final Fantasy VI challenege.