Scoring is based on the size of the "blob" you click on/eliminate. The bigger the "blob", the higher the score. Level 3 seems to generate the highest scores. I don't think they give extra points for clearing the board, although that is ostensibly the goal. There is a discussion on Hopeless scoring here: https://forum.greenfelt.net/discussion/comment/23402
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Scoring is based on the size of the "blob" you click on/eliminate. The bigger the "blob", the higher the score. Level 3 seems to generate the highest scores. I don't think they give extra points for clearing the board, although that is ostensibly the goal. There is a discussion on Hopeless scoring here: https://forum.greenfelt.net/discussion/comment/23402