We had the exact same idea which is kind of funny I did a lot of the same buildings, here's a link to mine https://www.jetpunk.com/user-quizzes/253425/guess-that-skyscraper-picture-quiz.
The Sears Tower is now called the Willis Tower. The actual name of the "Freedom Tower" is One World Trade Center, which should at least be accepted as a type-in.
Mecca Clock Tower doesn't work, it requires Makkah Royal Clock Tower, which is really not used except quite formally.