Overview
Cards and dice are a classic trading interview topic, and this game turns them into a live expected value exercise. One or two cards and one or two dice sit face down on the table, and the market quotes a price for the product of all their values. Before each round you answer standard deviation questions about the setup, then you decide whether the quoted market is too high or too low and buy or sell accordingly. The cards and dice flash face up for a few seconds before hiding again, so you compute your true profit or loss from memory. Cards are not replaced between reveals, so the expected value shifts as the game goes on. You start with 500,000 points and trade across several rounds to finish as high as you can.
Example: pricing a product of unknowns
Cards and dice go face down and the market is quoted on the product of all their values, not the sum, so the distribution is far wider than it looks. The game asks you for the standard deviation on its own screen first, and then quotes, which is the moment below: you take a side at whatever size you want.
The computer quotes: Buy at 520, Sell at 560.
Shares
1
5
10
Shares (integer)10
Buy
Sell
What is your profit or loss?
Write a minus (-) sign before the number in case of a loss.
1600
Submit
Two cards average 7 each and two dice average 3.5 each, so the table is worth about 600. Being offered it at 560 makes you buy the offer.
Game Phases
1
Answer the pre-game questions
Each round opens with typical interview questions on the standard deviation of the current dice and card setup. Work them out before any trading begins.
2
Read the market
The game quotes a two-sided market for the product of every card and dice value. Compute the expected value of that product and compare it to the quote.
3
Buy or sell
Buy if you think the true value sits above the market, sell if it sits below, and choose how many shares to trade to size your edge.
4
Reveal and settle
The cards and dice flash face up for a few seconds, then hide. Work out your actual profit or loss from what you saw and submit it. Cards are not replaced, so the odds shift each round.
Scoring
+P
Correct profit
When you correctly identify a profit, it is added to your total points.
L
Correct loss
When you correctly identify a loss, it is subtracted from your total, exactly like the real position.
0
Incorrect profit
Misjudging a profit changes nothing; you simply miss the gain you could have booked.
2L
Incorrect loss
Getting a loss wrong is punished: double the loss is subtracted from your total, so precision matters most when you are behind.
SD
Standard deviation questions
The pre-game standard deviation questions train the statistical intuition the trading rounds rely on.
You start with 500,000 points and your final score is what remains after all rounds. Correct decisions bank the profit or loss exactly, while an incorrect loss costs double, so disciplined expected value math beats guessing. Playing with the EV hint on, or with custom settings, does not record to the leaderboard, which is grouped by difficulty.
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