Being honest, I would have enjoyed it more if it compared a picture and the drawing, providing a score on accuracy. An interesting drawing game.
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I would have had an image shown first and use that + with leeway to calculate an accuracy. The further away from the guide the lines are lowers the accuracy whether the drifting is towards the inside or outside. Kind of like drawing over a marker drawing where the marker itself is an inch wide and you have a pencil. I hope that makes sense.