Quixote - it just struck me that draw a loop around was an odd choice of words when circle (in the sense of encompass with a line) would do.
I wondered if it meant something else was needed such as continuing the map outside the grid. I can’t see that it does though.
Circle is commonly used on exam papers and questionnaires. I have never seen draw a loop around used on this way. Indeed if you Google “circle the correct answer” (in speech marks) you get 623000 hits. “Draw a loop around the correct answer” gives only 1.