Doritos Quest was a campaign held in 2008 when Doritos debuted a mystery flavor called "Quest". The flavor was later identified as Mountain Dew.
The promotion started in 2008, when Doritos made a mystery flavor known as "Quest" and made a site for it featuring online puzzles and games to identify what the mystery flavor was. At the end of the promotion, the flavor was identified as Mountain Dew.
The Doritos Quest tortilla chips were sweeter than salty. They were said to taste like girl scout cookies, and on other occasions, Mountain Dew.