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In-game sports market making is a standard trading-interview exercise: the interviewer pulls up a live or simulated game and asks you to quote a bid and an ask on something that hasn't settled yet — total points, the margin, points this quarter — then trades against you as the game moves. SIG, Optiver, and IMC all run versions of it, from phone screens to super days.
What gets graded is the loop, not your opening number. A reasonable first quote is table stakes; what matters is whether you re-price when a team goes on a run, whether your spread narrows as time runs out, and whether you notice the position you've accumulated and skew to manage it.
This free game puts that loop on a clock. A simulated 48-minute basketball game compresses into a few real minutes while a desk posts two-sided markets on the game total, home margin, home total, and current-quarter total. The desk's quotes refresh on a lag, so when a scoring run moves the true fair, the stale quote is genuinely mispriced — your job is to track fair from pace and score, take the edge, and carry the book to the buzzer. Harder difficulties hide fair value and live P&L, the way the interview does.
A live exercise where you quote two-sided markets (a bid and an ask) on an unresolved game quantity such as total points, then update your prices as the game progresses while the interviewer trades against you. It tests fair-value tracking, re-pricing on new information, spread sizing, and inventory management.
SIG, Optiver, and IMC commonly run live market-making exercises across trading interviews, from phone screens through final rounds. The format is generic across market makers; a basketball game is just an information stream both sides can follow in real time.
A simulated 48-minute basketball game runs on a compressed clock of a few real minutes. A desk posts markets on the game total, home margin, home total, and current-quarter total. Quotes refresh on a lag, so scoring runs create takeable edge. Game markets settle at the final buzzer; quarter markets settle each quarter.
Yes. It runs in the browser with nothing to install. Easy mode shows fair value and live P&L while you learn; medium and hard speed up the clock and hide them, closer to interview conditions.