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30 : bomb left to the top 6 mouse. launch behind the middle line mouse to make it fall with the two lower. poison the top line, bomb the middle of the top to make a poisoned mouse fall on the 3. that should poison the last one too
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Having played all levels I don't believe they ARE all possible.
14, 18, 20, 24 & 30 don't appear to be do-able with what you're given.