Um, one person secretly works for the production crew, as "The Mole", trying to sabotage everyone else.
The people perform challenges, both individually and as a team or in pairs, each worth some amount of money. If they complete the challenge, they get the money - if not, they don't. So, the Mole is trying to keep them from getting money, but has to do it subtly.
Each episode, there's a quiz. It's a 20-question quiz with questions like "where was the Mole sitting at dinner tonight?" or "Is the Mole male or female?"
The person each week who gets the least number correct is eliminated. If two people tie, then it goes to who answered the questions fastest.
But in this Celebrity edition, there are no eliminations...