just heard about it while i was boarding a plane. Level 7 was quite hard, while the others were finished in 5 to 10 minutes. Level 7 took maybe an hour of tries

just heard about it while i was boarding a plane. Level 7 was quite hard, while the others were finished in 5 to 10 minutes. Level 7 took maybe an hour of tries. Perhaps even longer. You then get a popup with instructions to submit the final answer.