Balloon Stack

Jenga in reverse. Lift every balloon off the floor into the corner without letting one roll out.

You0 placedYour turn

Floor11 leftWaiting

Drag a balloon into the corner

Balloons differ. Some cling to their neighbors, some bounce right off. Squeeze one before you place it to get a feel for it.

How to play

Drag a balloon off the floor and let go over the corner. It settles where you drop it.
If any balloon rolls out past the lip, the stack falls. Get all 11 up to win.
One squeeze per turn. Grippy, soft balloons stack best.

Solo: stack all 11 yourself Versus the AI: take turns. Spill one and you lose; place the last balloon and you win.

AI inspector
Show the forecaster's odds, beliefs and decision trace

Forecast

—Pick up a balloon to see its odds for each spot.

Grip

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Bounce

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Each spot's odds come from physics simulations with the hidden values drawn from the model's beliefs. The shaded band is its uncertainty and the line its best guess. A squeeze is a noisy reading that narrows the band.

CalibrationBrier —

Forecast	Moves	Predicted	Held

A well-calibrated model's predicted and held columns match. Brier score: lower is better, 0.25 is a coin flip.

Decision trace0 spans

OTLP JSON: one trace per move, grouped into a session by session.id. Send it to any OpenTelemetry collector.