General ACCAWhich September 2021 ACCA Exam was the hardest?

How do you read this graph please? edit - no worries, figured it out, haha!

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Can someone show me how to interpret this please?

I gave atx so let me explain it with atx. Blue means easy, around 5% felt it was easy. Green means ok, around 45% felt it was ok. Yellow means hard, around 30% felt it was hard. Red means disaster, around 20% felt it was disaster. The graph is showing in percentage of all the view of student who took opentution poll.