Free OA prep
Dice Markets
A dealer quotes a market on the sum of five dice, some hidden. Work out the expected value, trade the mispriced quotes and pass on the fair ones. The market-making game trading firms use in interviews. Sign in and your best final balance goes on the leaderboard.
Each hidden die is worth 3.5 on average. If the expected total is above the ask, buy; below the bid, sell; in between, pass. Size up when the edge is big. Pick a difficulty or set your own rules.
Difficulty
2-3 hidden, 15s a round. The ranked setup.