I "missed" one of the comma questions, but I'm quite certain I was correct.
The sentence was "Of course there weren't enough tickets to go round."
I chose "no comma", but the game thought there should be one after "course". Both are grammatically correct, but would carry slightly different connotations.
"Were there enough tickets to go round?"
"Of course there weren't enough tickets to go round!"
Compared to:
"I then distributed the tickets. Of course, there weren't enough tickets to go round."
Therefor, the punctuation game was wrong in it's assertion that a comma is required following "course".
And so, I have corrected the punctuation game on a matter of punctuation.