Not sure that "faster than the speed of sound" is a great clue. I tried "speed of light" and even "Superman", both of which are true, but not accepted.
Oh come on. If you're looking for one word which means "faster than the speed of sound", the only one that makes sense is "supersonic". That's what it means!
Haha oops I thought that Jacob Marley was one of Bob Marleys kids that also went on to become a musician and that they wanted to know who his musical partner was. Dumb mistake.
Xu, Za, and Qi threw me completely off; I was thinking maybe it was some kind of board game based off the Warring States; rarely use these words when playing.
My first instinct was to put "sonic" too. I knew that "super sonic" was the only correct answer, but I thought that it was two words, while the instructions specified that all answers were just one. Finally I couldn't think of another appropriate word, so I joined them together and - Eureka! - it was accepted.
Also, the New Zealand answer tripped me up. I spent some time staring at it trying to figure out how "orcs" started with an S.
If you think iPhones are U.S. centric...