No change in music. Difficulty doesn't increase dramatically. And I got to Floor 53 and didn't unlock the "secret" medal - bummer since I was playing for 2+ hours. If I wasn't a math and numbers guy, I probably wouldn't have stuck around longer than 15 minutes. Maybe have a reason to get the answer in a certain number of guesses? Or something to use those tokens for - increased number of guesses, smaller window for answer, etc.