Dial in a planet's distance, speed and mass, hit launch, and hold its orbit inside the green habitable zone.
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How to play
Adjust three sliders to set up your planet, then launch a deterministic gravity simulation that plays out in real time. A green ring marks the habitable zone; your score climbs the longer the planet stays inside it. A run ends if the system collides or ejects the planet, or when the time budget expires.
Too slow and the planet spirals in; too fast and it flies away
The green ring is the band you're trying to keep the orbit within
The planet leaves a trail so you can read whether its orbit is stable
Controls
Desktop: drag the distance, speed and mass sliders, then click Launch
Phone & tablet: drag the sliders and tap Launch, fully touch-friendly
Game modes
Daily: one shared seeded star system each day
Practice: endless new setups
Tips & strategy
A near-circular orbit (matching circular orbital velocity) holds the green zone longest
Set distance first, then fine-tune speed to round out the ellipse
Higher mass tugs the system harder, adjust speed to compensate
What you'll learn
Worldsmith is an orbital-mechanics sandbox driven by a genuine N-body gravity model, letting you feel how gravity shapes orbits.
Skills: orbital mechanics, gravity, N-body motion, systems simulation
Best for: roughly grades 9–12 (ages 14+)
For parents & teachers: real gravitational physics to play with and explore.
About Worldsmith
Worldsmith is an original orbital-mechanics sandbox driven by a genuine N-body gravity model. It's free to play directly in your browser.
A free, original browser game on PlayPendium. No download, no install.
