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If you're prepping for a trading internship interview, the round this game simulates is the market exercise: the interviewer puts a price on something — a sum of dice, cards, the number of windows in the building — and you have to compute a fair value quickly, then trade or quote around it. At prop firms like Optiver, SIG, IMC, and Flow Traders this shows up alongside the timed mental-arithmetic test, and it's where most candidates lose points: not on the math itself, but on doing it fast while deciding whether the posted price is actually off.
Fruit Market is a free browser drill for exactly that skill. You see two bags of apples and oranges; the fair value is (total apples) × (total oranges). A bid/ask is posted, and you have seconds to act: buy if the ask is below fair, sell if the bid is above it, or pass when the market straddles fair — about a third of quotes are fair, and passing them is part of the score. Quotes refresh every 4–9 seconds depending on difficulty, the clock runs three minutes, and you're scored on realised edge, accuracy, and speed.
In the live round you're usually the one quoting while the interviewer trades against you, but the graded skill is the same one this trains: holding an accurate fair value under time pressure and only trading when the price gives you edge. No signup, no setup — pick a difficulty and start.
An interviewer asks you to price an uncertain quantity (dice totals, card sums, an estimation question), then trades against your quote or posts a price for you to trade. It tests fast mental arithmetic, a consistent fair value, and the judgment to trade only when a price deviates from it.
Two bags of apples and oranges are dealt; the fair value is (total apples) times (total oranges). A bid/ask is posted and you buy, sell, or pass before it refreshes (every 4-9 seconds by difficulty). A three-minute session is scored on realised edge, accuracy, and speed.
Yes. Fruit Market runs in the browser with no signup or download. Choose easy, medium, or hard, which sets the count sizes and how often quotes refresh.
Market games and timed mental math are standard in trading intern processes at proprietary trading firms such as Optiver, SIG, IMC, Flow Traders, and DRW, both in online assessments and live interview rounds. Formats vary by firm, but the fair-value-under-time-pressure skill is common to all of them.