Play Megagem, the card game by Jane Street and Richard Garfield

"A game that combines strategy, mathematics, and a sense of adventure to simulate open market trading."

It's a very weird hidden-information game made by Magic: the Gathering's original designer and Jane Street's trading-training contingent, and hard to find, and a lot of fun!

It's structured as a series of first-price sealed-bid auctions, determined by an auction deck - mostly for one of the gem cards that come out of the public deck, but sometimes for both visible gems, or for a loan, or an investment. Winner takes the gem (or investment, or loan and debt) and permanently reveals some information.
But each player has a hand of gem cards, the gems they know won't be auctioned later - and the value of gems depends on how many are going to show up. You slowly reveal the hand as you win auctions, choosing what information to become public - and guessing what other players know based on what they do.