Mental reps for the trading floor.

Timed mental-maths drills and a market-making simulator, built for quant and trading interviews. Practise free; sign in to track progress.

Daily challenge · Not done yet
Five hard questions. Sixty seconds. Same five for everyone.
One attempt per day. The clock starts when you press start, and leaving early counts as your attempt. Resets at midnight UTC.
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Set the time, pick how many questions of each section. Saved tests appear on the homepage so you can rerun them any time.

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Market making · simulator

Quote it. Get hit. Settle up.

Make a two-sided market, get picked off when your price is wrong, and settle your book from memory. The core market-making skill, drilled.

1

Quote

Post a bid, an ask, and a lot size around your estimate of the hidden fair value.

2

Get traded

The bot buys above your ask and sells below your bid. Quote tight or get picked off.

3

Settle

Bracket the value within 10%, then estimate your P&L, lots traded, and average trade.

Choose a round type

Make a market on a real-world fact or a quick computation, then requote tighter until you bracket it within 10%.

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