Sealed bids. Hidden valuations. The winner's curse.
The Premise
Sealed-bid auction game with hidden item valuations. Players bid on items whose true value is partially hidden. Each round 3 of 5 attributes shown, each player has private info about 1 hidden attribute.
Bid your private info's worth = you might overpay. Bid lower = you might lose to a less-informed bidder who got lucky.
The Roles
Bidder
×allEach has private info on 1 hidden attribute per item. Submits sealed bids.
How a Round Plays
Item revealed
An Item is revealed with 3 of 5 attributes shown.
Private intel
Each player has private info about 1 hidden attribute.
Sealed bids
Each player writes a sealed bid.
Award
Highest bid wins, pays bid. Item joins their portfolio.
Win Conditions
Highest portfolio
Highest portfolio value at end (true item value × ownership).
Designer Notes
The "winner's curse" game (you only win when everyone else thought it was worth less, suggesting you overpaid). But the private info mechanic means sometimes you're right to pay more. Every bid is signal AND deception.
Strategy Tips
- Bid range, not pointPlan your bid AS A RANGE based on what you don't know.
- Bait with high opensA high opening bid signals confidence — and can scare informed players off.
- Track portfoliosPlayers sitting on a fortune will outbid you on the last item.