I just played that one. Even if the song title is Walkin' on the sun, in a wordwise quiz you need to write what you see, which is walking on the sun. Then you submit a correction note to point out that the title is not correct. The Mambo No 5 one is nastier - since I didn't even consider the full stop, I got it right, and didn't see the range of accepted options.
I have sent in a correction note on the quiz registering your concerns.
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(Editor in Humanities, Religion, Literature and For Children)
That's all, folks!