Try googling by it's name of "1 vs 100". The game played out where one person was randomly chosen as the main contestant who answered trivia questions. If they failed a question they were booted.
The kicker to the game was, 100 other randomly selected players were playing against you answering the same questions. If they got it wrong, and the contestant got it right they were eliminated and the contestant continued.
The goal of the main contestant was to outlast the 100 players, and the more they outlasted the better prizes (usually MS Points) they won. The goal of the 100 was to outlast the main contestant to also win prizes (usually less than the main).
All other players watching the game could participate for fun and play along for no reward. It was actually pretty fun and the events all happened live with an announcer and everything.