In a common value auction game, players simultaneously bid on the item being auctioned.
Prior to bidding, they are given an estimate of the actual value of the item. This actual value is revealed after the bidding.
Bids are private. The player with the highest bid wins the auction, but payoff depends on the bid amount and the actual value.

This application provides a webpage instructing participants how to get paid. Examples are given for the lab and Amazon Mechanical Turk (AMT).