TICKETS 03 OF 3 RUNS LEFTACC --

Outcry

The Guide Book

A written strategy guide for every game in the arcade - the rules, how scoring works, the technique that actually raises your score, and one fully worked example each. 59 guides across 12 labs.

Brain Teasers

Brain Teasers LabA shelf of classic logic and game-theory puzzles, each played as an animated story that makes you commit to an answer before revealing the reasoning.Read the guide →Screwy PiratesFive rational pirates vote on how to split 100 gold coins, and you work out the split by backward induction from a one-pirate crew up.Read the guide →Tiger and SheepA hundred rational tigers and one sheep on a magic island, where any tiger that eats becomes a sheep itself - solved by induction on parity.Read the guide →The Split DealThe prisoner's dilemma played as a story: two thieves, separate rooms, and one offer each.Read the guide →Stag or HareThe stag hunt as a story: two equilibria, and a choice that is about trust rather than logic.Read the guide →One Offer, No DiscussionThe ultimatum game as a story: one split of 100 pounds, one accept-or-reject, no negotiation.Read the guide →The Growing PotThe centipede game as a story: a pot that doubles on every pass, and logic that says take it immediately.Read the guide →Two-Thirds of the RoomThe Keynesian beauty contest as a story: pick the number closest to two-thirds of the room's average.Read the guide →One Seat in the BoatThe wolf, goat and cabbage river crossing as a story - seven crossings, one backward move.Read the guide →The Office BetThe birthday problem as a story: a colleague bets that two of the 23 people in the room share a birthday.Read the guide →The Third DoorThe Monty Hall problem as a story: you pick a door, the host opens a goat, and offers a switch.Read the guide →The Line of HatsThe hundred-prisoner hat line as a story: one word each, and a parity code that saves 99.Read the guide →The Rope BridgeThe torch-and-bridge puzzle as a story: speeds of 1, 2, 5 and 10, and a storm 17 minutes out.Read the guide →

Quitters Never Lose

BlackjackReal 4-deck blackjack with live exact bust probabilities and a Hi-Lo counting check under a pit-boss timer.Read the guide →Russian RouletteA shrinking elimination wheel where every safe spin compounds a 97%-of-fair multiplier and every wrong answer marks another losing number.Read the guide →Pick 3A real Pick 3 lottery ticket where every play type - Straight, Box, Pair - carries the identical 50% house edge.Read the guide →Pick 4Four digits, a $5,000 Straight, Front/Back 3 bets - and the same exact 50% house edge on every play type.Read the guide →Pick 5Five digits and a $50,000 Straight at 1 in 100,000 - the biggest jackpot in the lab, at the same 50% house edge.Read the guide →Scratch-Off (Timed, 7 Questions)Scratch tickets with the odds printed face-up: 7 probability questions per ticket on a 5:15 clock, then a buy-or-walk decision.Read the guide →Scratch-Off (Timed, 13 Questions)The deep timed scratch-off: 13 probability questions per ticket on a 9:45 clock before every buy-or-walk decision.Read the guide →Scratch-Off (Untimed, 7 Questions)Scratch tickets with the prize table face-up and no clock: 7 probability questions per ticket, then buy or walk away.Read the guide →Scratch-Off (Untimed, 13 Questions)The full-depth untimed scratch-off: 13 probability questions per ticket across all six topics, then a buy-or-walk decision.Read the guide →

Statistics Lab

Crack the BotInfer the hidden rule driving an algorithmic trader by running real regressions on its tape - and learn to say 'there is no rule' when the data says so.Read the guide →Twenty BacktestsDecide which of a book of backtested strategies - if any - deserves funding, once you account for how many were tried to find the winner.Read the guide →

Finance Lab

Basket ArbitrageReplicate mispriced commodity baskets from their components, net every exposure to zero, and lock in riskless PnL against one shared session clock.Read the guide →Delta DefenderWrite a hedgeRatio function that tracks a short call's true Black-Scholes delta across a fresh random scenario and GBM price path every run.Read the guide →Market MakerQuote bid and ask around a random-walking fair value for 10 rounds, computing Avellaneda-Stoikov reservation prices while informed flow tries to pick you off.Read the guide →

Stochastic Processes

Ruin WalkerRun an insurance book under the real Cramér-Lundberg model - choose your safety loading, answer a closed-form question each period, and try to survive 12 periods without your surplus going negative.Read the guide →Martingale MutinySail a wealth process with a flat positive edge against a proportional storm that halves your hold - and get graded on predicting the recursion's expected value when you choose to stop.Read the guide →

Gradient Lab

Eigenvector SpotterGiven a 2x2 matrix and four candidate directions, click the one that A merely stretches instead of rotating - the eigenvector.Read the guide →Lagrange OptimizerMaximize xy on a budget line ax + by = k by actually solving the Lagrange condition ∇f = λ∇g for x* - no readout to chase, just the algebra.Read the guide →Newton StepperPredict how many Newton iterations it takes to drive x² - a = 0 from x₀ = 1 to within 1e-4 of √a - then watch the actual step table and see how quadratic convergence behaves.Read the guide →PSD ClassifierClassify a symmetric 2x2 matrix as positive definite, positive semidefinite, indefinite, or negative definite using trace and determinant - the test that decides whether it could be a covariance matrix.Read the guide →Taylor SliderSum a Taylor polynomial by hand - order 2, 3, or 4 for eˣ, sin, cos, or ln(1+x) at a given point - and learn how fast the error actually shrinks.Read the guide →

Algorithm Arena

DP Table BuilderFill a dynamic-programming memo table cell by cell, from given base cases and a stated recurrence, until the final answer falls out.Read the guide →Mini Task - RookieA rookie-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - Rookie (First Challenge)A rookie-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - NoviceA novice-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - Novice (First Challenge)A novice-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - IntermediateA intermediate-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - Intermediate (First Challenge)A intermediate-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - AdvancedA advanced-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Mini Task - Advanced (First Challenge)A advanced-level coding challenge: two warm-up questions, real code run against real tests in your browser, then two wrap-up questions.Read the guide →Monte Carlo EstimatorEstimate pi by throwing random points at a circle, watch the error shrink with sample size, and internalize why halving the error always costs four times the samples.Read the guide →Speed RoundTen multiple-choice questions, twenty seconds each, drawn from a shuffled pool spanning complexity, dynamic programming, Monte Carlo, and pandas.Read the guide →

Quant Dev Lab

Concurrency ClashA five-level code review of freshly generated concurrent C++ snippets: flag the exact line that carries the defect, then pick the fix worth shipping.Read the guide →The Order Book EngineImplement a price-time-priority limit order book in the browser, pass an 11-check matching script, then beat a latency gate built around O(1) cancels.Read the guide →

Risk Lab

Tail Risk Stress TesterRun a $100M multi-asset book through a correlation breakdown and learn why VaR is silent exactly where Expected Shortfall speaks.Read the guide →

Economic Consulting

The Antitrust SimulatorDefine the relevant market for a merger, compute the HHI delta, and file the recommendation the guidelines actually support.Read the guide →The Causal ConfounderEstimate damages with difference-in-differences, then find the one confounder that actually biases the estimate before opposing counsel does.Read the guide →

Actuarial Lab

Loss Triangle LabyrinthDevelop a run-off triangle with chain ladder link ratios, set the total reserve, and know when to switch to Bornhuetter-Ferguson.Read the guide →Survival RunPrice a 20-year annuity from a mortality table one hurdle at a time, then absorb a longevity shock that reprices the whole book.Read the guide →

Drill Lab

Arithmetic DrillA 20-card flashcard race across twelve arithmetic categories - play solo or race a ghost recording of a real past run.Read the guide →Fermi Estimation (Classic)Quote a low-high range on ten real-world estimation questions - points for containing the truth, more points for a tight range.Read the guide →Fermi Estimation (Technical)Assessment-style estimation - dice boards, grid paths, latency and microstructure calcs - scored on relative width like a quoted market.Read the guide →Sequence SprintFind the rule and type the next number - freshly generated arithmetic, geometric, square, alternating, and Fibonacci-style sequences.Read the guide →Dino DashA Chrome-dino endless runner where the only way to jump is answering a mental-math question - one cactus hit ends the run.Read the guide →Likelihood RankingOrder outcomes from most to least likely - student score tables, distributions, dice and card events, Poisson arrivals, urns, and scatter plots.Read the guide →Crossroad MultitaskerA duck at a 4-way crossroad and four corner math pods - answer whichever question is live as it switches unpredictably between the two streams.Read the guide →