Overview
The Marble Olympics is a real-time trading simulation built around a marble football final. Two teams shoot marbles at an orange and a red goal over 90 game minutes, compressed into 10, 20 or 30 real minutes. Team strength is hidden: before kick-off you study the bracket, where both finalists played their earlier rounds with the same accuracies and shot counts, so past scores are your estimator of how good each team really is. Once the match starts you trade a main market that settles at Team A total times Team B total, snipe stale quotes after goals, and pick off mispriced one-shot side bets. Everything settles on the actual final counts.
Game Phases
1
Study the bracket
Team strength is hidden, but each finalist played its earlier rounds with the same accuracies and shot counts as the final. Estimate each team's expected final total before kick-off, because every price you will see derives from it.
2
Trade the main market
The main market settles at Team A total times Team B total. Buy at the ask or sell at the bid as often as you like, in size 1, 5 or 10. The spread is about one point and drifts over the match.
3
Snipe stale quotes after goals
When a goal lands, fair value jumps instantly but the quote only catches up over about a couple of seconds. The first profitable trade in that window takes advantage of the remaining edge, and it snaps the market back to the new fair value.
4
Pick off the side bets
Side bets on the final marble counts appear in batches, each live for exactly 60 seconds, and can be traded once each. The quotes are close to fair but never exact, and non-linear payouts hide extra value in their corresponding variance.
Scoring
PnL
Everything settles at full time
At 90:00 the main market settles at Team A total times Team B total and every side bet pays out on the actual final counts. Your score is your total settled PnL.
+2/4/6
Points for a profitable match
Finishing with positive PnL earns platform points scaled by match length: 2 for a 10 minute game, 4 for 20, 6 for 30.
Pause
Pause when life interrupts
A match runs 10 to 30 real minutes, so you can pause and resume it. Trading is disabled while paused.
Replay
Review every trade afterwards
After full time you can replay the whole match and walk through every quote and every fill to see where the edge was.
The Top Scores boards rank on settled PnL (main market plus side bets) and group by match length, so a 10 minute final only competes with other 10 minute finals. Longer matches mean more shots per goal and more side bets, which is more opportunity and more risk.
Top scores
Start Your Interview Preparations!
Already have an account? Log in!
Your progress
📊 Track your progress
See your scores over time and watch yourself improve.
Start Your Preparation
Already have an account? Log in
More Practice