Bump for still having no clue how to deduce key 2 from the given data.
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Bump for reaching the end. Thanks for the puzzles.
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I've solved all the keys except for number 5. I'm not even sure I've stumbled upon the clues for that one.
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Thank you again for this hint. It did not directly show me where the next step was, but it pointed me to the right place to focus my search on (so I wasn't wasting my time looking everywhere else).
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Last bump, 45 min left
Edit .
Nice job with K3.
As for K5 it was a bit tricky. I almost missed it as I checked only the selectable part and only your last hint made me recheck the assumed key location, Laziness can be costly ^^
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