Nine coupled pendulums on a real g = 9.81. The small-angle period is printed underneath, and the chaos beside it is the point.
Small-angle period is T = 2πsqrt(L/g) and does not depend on amplitude. Past ~15° the true elliptic-integral period runs longer. Drag a bob to pull it aside and let go; arrow keys shove it.
Nonlinear, and it matters
An explicit leapfrog finite-difference solver. Resonance, standing waves and superposition, with the measured period next to the theory.
A soundboard of 25 sounds, all synthesised live in your browser with Web Audio.
27 elements, density physics and real pair reactions — pour, ignite, dissolve, grow.
A real 3D voxel world of 92,160 cubes. Paint sand, water, lava and fire and watch density physics run.
Light-cycle duel against the CPU or a friend. Walls and trails are fatal.
Spend gold each season to grow a village to 24 people before the year runs out.
Kepler-orbit racing: pick a trajectory, burn, and coast to the next marker.
Turn-based tactics on a hex-free square grid: move costs, line of sight and a real AI.
