In this game, twenty oil companies are bidding for a field of oil of uncertain value in a sealed bid second price auction. All oil companies make their own private assessment of the value of the oil field, and bid c*v where c is a constant, and v is their assessment of the true value of the oil field.
If you were to participate in this auction, it would be a good idea to bid the true value of the oil field, but not necessarliy to bid what you think the true value is.