Orbholt: Gravity Sandbox

A gravity sandbox: place stars and planets, fling moons into orbit with a path preview, and watch the trails. Then take on eight orbital challenges, from simple laps to a slingshot and a loop around two stars. Free, no ads, no tracking.

Orbholt is a gravity sandbox. Pull back, let go, and watch a moon swing around stars and planets, with a dotted line that shows the path before you throw.

Play freely, or take on eight orbital challenges, from two simple laps to a loop around two stars.

• Path preview for every throw
• Free play: place stars and planets, erase them, speed up time
• Eight challenges: laps, a parking ring, sparks, a moon of a planet, a slingshot exit, three at once, two stars and a puzzle
• Trails that draw every orbit
• Up to three stars per challenge for using fewer moons
• Mouse, touch and keyboard

Code and text written with AI assistance; checked by PN Scripts with automated tests. Every shape is drawn and every sound synthesised by code; there are no AI-generated image or audio files.

Controls

• Drag back from a point and let go: fling a moon (the dots show its path)
• Tap a tool: moon, star, planet or erase (free play)
• Arrow keys: move, A / D: turn, W / S: power, Space: throw or place, 1-4: tools
• R: restart, F: faster time, P / Esc: pause, M: sound

Made by PN Scripts.