| Gondola Headcount Puzzle | Reasoning | IMC Trading | Free |
| Legs at the Barnyard Fair | Reasoning | IMC TradingSIG+1+2 | Free |
| Shared Birthdays in a Small Seminar | Probability | Flow TradersTwo Sigma+1 | Free |
| The Scrambled Coat Check | Probability | DRWHudson River Trading+1 | Free |
| When the Hands Meet Again | Reasoning | VIRTU FinancialJane Street+1 | Free |
| Boardwalk Parity Bets | Probability | SIGJane Street+1 | Free |
| Nine Minutes from Two Sand Timers | Reasoning | Flow Traders | Free |
| The Corridor of 500 Lockers | Reasoning | DRW | Free |
| Locking In a Riskless Dollar | Finance | SIG | Free |
| Counting Every Square and Rectangle on an 8×8 Grid | Reasoning | IMC TradingMaven Securities+1+2 | Free |
| The Doubling Coin Game With No Fair Price | Probability | Akuna Capital | Free |
| Eight Rings and a Pan Balance | Reasoning | SIG | Free |
| Twenty-Five Swimmers, Five Lanes | Reasoning | Optiver | Free |
| A Son Born on a Tuesday | Probability | Citadel Securities | Free |
| Collecting All Six Faces | Probability | Jane Street | Free |
| Ten-All, Win by Two | Probability | Optiver | Free |
| Platoons on the Mountain Road | Probability | Jump Trading | Free |
| When the Product Lands Even | Probability | Jane Street | Free |
| Engineering a Forty Percent Chance | Reasoning | Akuna Capital | Free |
| The Better of Two Bids | Statistics | Optiver | Free |
