The Mole

 
9
A sabotuer. A traitor. The Mole. 10 contestants step into the ring to play for up to 500,000$ dollars, while one contestant is being paid by us to sabotage the others, preventing money from entering the group pot. The person who knows the least about who the Mole is is eliminated at the end of each round, becoming the Mole's next victim. During this match only one question remains. Who is the Mole?