Intelligence

I think intelligence plays a very important part in this game. First off, several of the challenges involve puzzles or brain teasers of some kind. Second, you need to be street smart, as well and be able to tell who is in alliances together, and who might be playing against you on your team instead of with you. Another thing is, you need to be smart enough to know who to make an alliance with. In my opinion intelligence is necessary to win the game.