Press space to start- that is because pressing the green flag and starting is pretty hard. Also, when trying again press the green flag to delete the clones, then press space again. Move the mouse around and try and dodge the blue bubbles. The score function is simple- it just records the number of seconds you have been on. If your score doesn't reach the high-score, but you are still proud of it, feel free to just post your score in the comments.
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