Players have 12 riddles per team and the team with the most riddles solved at the end of the time limit wins.
Answers (and an adjudicator per team to confirm the correct answers)
Use the attached brain teaser cards. Give the teams a set of cards each.
When the time starts then the teams can look at the riddles, they then attempt to solve them with answers matching those on the sheets, which the adjudicators will validate (with a Yes or No only).
When the time runs out the team with the most solved riddles wins.