Beat all of the mini-games!
There is mission 0 which would be the first mission but there is also mission 1. mission 0 clue=uranium(which is clue#11) mission 1 clue=phosphorus(which is clue#13) You can not enter clues by the way. You have to do the combos or missions.
There is no cheat in any games in the 39 clues.
Croatia.
You beat mission seven...
Google it. Youtube.
Jane4
Fight
Fight
the answer is LUKE1
Jane4
If your talking about mission 0 then it is luke1
It is already available at the 39 clues mission.
death
Fight
Jane4
Fight