The card code is MANINBLACK. Hope I helped you out there.
P23HRFXFXP enter this in your cards to get your clue box
P23HRFXFXP enter this in your cards to get the 75th clue
P2hcj6hcxp P39FFM3PXP
the answere is P3M4K4RDXP
Enter this in your cards to get the 3rd clue P23HRFXFXP
They organize the 39 clues cards by card numbers.
P23HRFXFXP type this code in your cards to unlock a clue
this is a rare card code:P24NXKNMXP
You collect the cards from the card combo "The Founding Fathers". The clue is honey.
There are 6 clue cards in the first book of The 39 Clues series. Each card reveals an important clue or hint as part of the overarching mystery explored in the series.
Tungsten is not clue number 4. Tungsten is available in book 2 cards and is clue number 28.
The way to find out clues, is by collecting the proper cards that are listed for that clue. You can do that or you can enter a book code, to find a book clue.