Where will the ball land?

The ball is released once, collides with the pegs, and lands in one of seven slots numbered left to right. A slot resolves Yes when the ball first reaches the floor inside it; all six other slots resolve No. Every winning share pays 1 gold. Trading closes and resting orders expire at that instant. The next ball follows after a short result display. If the ball fails to reach a slot within 12 physical seconds, the round is void: remaining positions receive their cost basis back and unfilled orders are released.

Gravity, circular contact geometry, friction and restitution drive the ball; no bin is selected in advance. Small variations in the release position and horizontal velocity create new trajectories each round. The release position varies within ±0.22 m of the centre. This round's x₀ and vₓ₀ stay visible above the board throughout the fall. Download Round data for the full-precision starting state, geometry and release time; y is measured downwards from the board's top, in metres. Motion plays at a slower pace, with each transit lasting at least 75 seconds and full rounds lasting 1–5 minutes so there is time to observe and trade.

This is a two-dimensional rigid-body model using Planck.js / Box2D ↗. The browser draws the server's observed positions; trading never changes the physics. Quotes are observation-based estimates, not calibrated scientific probabilities.

A Galton board is governed by rigid-body contacts. Planck uses circular shapes, gravity, friction, restitution, and a fixed 120 Hz step with continuous collision detection. OpenFOAM remains the fluid solver for the aerofoil experiment.