Real Newtonian gravity at the real G. Start from a circular orbit, nudge the planet, and watch the ellipse appear.
Newton’s law with the real G, integrated symmetrically so energy and angular momentum oscillate instead of drifting. a − GM/r² for the two-body preset: halve the orbit’s semi-major axis and the period should fall by 23/2.
Kepler you can poke
A real Gray-Scott solver. Eight regimes - mitosis, coral, worms, solitons, fingerprint - and the feed/kill map that makes them.
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.
Drop the sliding block and stack it clean. Perfect cuts keep full width.
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.
