Market Making
Market makers continuously quote both a buy and a sell price on a security, earning the spread between them while managing the inventory risk that comes from constantly trading both sides.
Quoting tight, well-centered markets and reading depth — the core loop of a market maker's day.
Games for this track
Quote a bid and ask. Wear the risk.
Market Making
Post a bid/ask spread against a hidden fair value. Counterparties trade against you — a tight, well-centered quote wins; a wide or mispriced one loses.
Relevance ★★★★★
Read the book, fast.
Mental Order Book
A live bid/ask book flashes on screen. Spread, mid price, walk-the-book fill price — answer before time runs out.
Relevance ★★★★★
Buy here, sell there, mark it now.
Trading P&L Sprint
Track a rapid sequence of buys and sells at an average cost basis, then compute realized, unrealized, or total P&L before time runs out.
Relevance ★★★★★
Coins, dice, and cards — fast.
Probability Blitz
Rapid-fire probability questions: coin flip combinations, dice sums, card draws. Answer within tolerance before time runs out.
Relevance ★★★★★
How much of your bankroll?
Kelly Criterion
Given an edge and the payout odds, compute the Kelly-optimal fraction of your bankroll to bet.
Relevance ★★★★★