Yes, it is free to use the 39 Clues website.
Yes
The contest for free The 39 Clues cards expired in 2011. To get cards now, you must purchase them.
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no were
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I don't think you can.
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no, the game is free
It means that 29 of the 39 clues are currently available.
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They only have 39 clues.
Online, the second clue in the 39 clues is hydrogen. But in the second book of the 39 clues is tungsten