Free 2D space sandbox

Build a rocket.
Cross the galaxy.

A rocket building game with real orbital physics. Put a spacecraft together part by part, fly the solar system at full scale, then point it at one of 1,215 real nearby stars and the procedurally generated worlds beyond. Alone, or with friends in the same universe.

Download free Join the Discord

Windows · Linux · Android · iOS

Real gameplayBuild, launch, then zoom out to the edge of the observable universe.

1:1the real solar system, at full size

1,215real star systems you can fly to

∞generated worlds across the Milky Way

317parts for rockets, rovers, planes and stations

Freeon Windows, Linux, Android and iOS

01 / Interstellar travel

Every star on the map
is a place you can go.

The stars near the Sun are the real ones, with their measured distances, colors and confirmed planets. Past them the Milky Way continues with procedurally generated star systems that are the same for every player. Pick a star, plan the burn, warp the years away, and arrive.

The galaxy map around the Sun, labeled with real nearby stars such as Sirius, Vega, Betelgeuse and Alpha Centauri — Galaxy mapThe Sun's neighborhood, with real stars such as Sirius, Vega and Betelgeuse.

Charted

Real stars, real planets.

Alpha Centauri, TRAPPIST-1, Sirius, Vega, Betelgeuse and more than 200 hand-charted systems, including real binaries and confirmed exoplanets.

Procedural

Worlds nobody has seen.

Every other star gets a full procedurally generated system: lava worlds, ocean planets, ringed giants, moons with air and forests. Same seed, same worlds, for everyone.

Beyond

Then keep going.

Visit black holes, pulsars and supergiants. Zoom out past 916 real galaxies to the cosmic web, and fly to stars in Andromeda.

Found with the star finder

Go planet hunting.

Ask the galaxy for a habitable planet, a moon thick enough to hold air, a ringed giant or a pulsar with planets. The star finder searches outward from wherever you are and lists the nearest matches.

Ocean world
Open sea, island chains and heavy cloud around a yellow-white star.
Island planet
One continent in a shallow sea, 45 light-years from home.
Living moon
A moon with air, seas and forests, circling a planet of a red dwarf.
55 Cancri e
A real exoplanet, rendered as the lava world it is thought to be.
Volcanic moon
Sulfur plains and active vents, heated by its planet's tides.

The star index FIND tab listing nearby stars with habitable-zone planets — Star finderSixteen habitable-zone planets within 42 light-years of Earth.

Search the galaxy
like a catalog.

Filter by star type, number of stars, planet kind, size, gravity, liquid surface, rings, habitable zone and moons. Or tap a ready-made search and see what turns up.

Habitable planetPandora-like moonRinged giantPulsar + planetsBlack hole

How the star finder works →

Sagittarius A*, a black hole surrounded by a glowing swirl of infalling gas — Black holesClose orbit around Sagittarius A*, the black hole at the center of the Milky Way.

02 / The long way round

Interstellar travel.
No warp drive.

Trips between the stars use the engines you built, and time warp runs up to 100 trillion times so a voyage of centuries takes minutes. Push a craft toward light speed and the clocks split: the crew ages less than the universe they left behind.

Orbit a black hole on the way, or slingshot past a binary star to save fuel.

Getting there →

03 / Multiplayer space game

One universe.
Everyone in it.

A multiplayer world runs on one server with the same physics as single player, so what you see is what your friends see: the station they docked to is exactly where it is on your screen. On a dedicated server the world keeps turning while you are away.

Multiplayer, three real clientsSpectating a friend's launch live while Alice waits at her station in orbit.

Warp without waiting.

Time warp on your own whenever you like. Your craft flies ahead of the shared clock, then one tap on SYNC brings you back. Nobody holds anyone else up.

Fly together.

Dock with a friend's station, ride along as a passenger, chat from the builder and spectate anyone's flight. Hosts can let players go to each other and summon them.

Across star systems.

One player at Proxima, another at TRAPPIST-1. The galaxy map shows where everyone is, and spectating works between stars.

Your server.

Host from the game and share a room code, or run the free dedicated server on Linux and leave the world running for days.

The galaxy map with player tags: Alice at TRAPPIST-1 and Bob at Alpha Centauri — Across the starsAlice at TRAPPIST-1, Bob at Alpha Centauri, same world.

Alice's station, Bob's orange and white rocket and a small capsule in orbit, with name tags and chat messages — Together in orbitLater, in orbit: Bob arrives at Alice's station.

Everything about multiplayer and hosting →

04 / Rocket building

From a handful of parts
to whatever you can imagine.

Snap parts onto a grid, resize them, plan the stages and paint the result. The same parts make rockets, planes, rovers, walkers, stations and machines nobody has a name for yet. It is 2D on purpose: you can build a 400-part ship on a phone and still fly it through a full-size solar system.

A player-made orange and white rocket in the builder with its staging panel open — Builder“Example Rocket” by Mistiy, from the Hangar, with its stages.

A drill craft inside a tunnel it cut under the lunar surface, below a vertical shaft — ExcavationDrills cut shafts and roofed tunnels.

A dark red rocket streaking through the upper atmosphere wrapped in pink and violet plasma — Re-entry“big crimson” by mercuryman34, from the Hangar. Heating follows the exposed shape.

A propeller plane with wings and landing gear in the builder — PlanesNot every build is a rocket.

An astronaut planting a red flag beside a capsule on the Moon — EVABoots on the Moon.

A raft carrying cargo on the open sea — WaterBuoyancy follows the shape of the hull.

Built by players

Fly something
somebody else dreamed up.

The Community Hangar is full of player designs, from tiny probes to walking mechs. Download one in the game, take it apart, and publish your own.

Open the Community Hangar →

05 / A physics engine of our own

Craft hold together.
Orbits never drift.

Rocket Foundry does not borrow a game engine's physics. Its simulation was written from scratch for spaceflight, in 64-bit precision, so a station stays exactly where its orbit says it should be after a year of time warp.

Take the engineering tour →

Exact orbits.Coasting craft ride a solved two-body orbit, with no drift at 1× or at billions of times warp.
Nothing gets paused.Spent stages, probes, debris and stations in your star system keep obeying physics while you fly something else.
One set of rules.Thrust, drag, buoyancy, wheels, parachutes, heat and contact all run through the same flight integrator.
Steady at any distance.A floating origin keeps a craft rock-steady on the pad and precise out past Neptune.

Body Studio editing Proxima Centauri, with atmosphere settings beside a live preview of the red dwarf — Body StudioBody Studio, editing a real star in another system.

06 / Modding without code

Edit the universe.
Then share it.

Body Studio reshapes any planet, moon or star with a live preview. The part editor, moving-parts editor and Engine Lab let you author new hardware, with no code.

Package it as a mod, send a whole world to a friend as one file, or publish your best craft to the Community Hangar.

Body StudioPart editorEngine LabModsHangar

The Engine Lab with a solid rocket booster plume and its placement and size sliders — Engine LabShape every flame in the Engine Lab.

The moving-parts editor animating a landing leg along a timeline — Moving partsGive a part its own mechanism.

07 / And then some

There is a lot to get
sidetracked by.

Career

Six chapters of missions, from Flight Academy to Venus, a return trip from Mars and work between the moons of Jupiter. Earn your parts as you go.

Mission Lab

Teach a craft to fly itself with visual program blocks: ascents, powered landings, rendezvous and full voyages.

Walk outside

Climb out on EVA, plant flags, collect rocks, fly a jetpack and climb back in through the hatch.

Dig in

Point a powered drill at the ground and cut shafts, trenches and roofed tunnels through solid rock.

Gravity games

Switch on N-body gravity, make a planet heavier, and watch every orbit in the system respond.

Pick a scale

Fly the solar system at its real size, or choose a 1:10 or 1:20 world with the same rockets and gravity.

The map planning a gravity assist past one star of a binary pair toward a planet of the other — Gravity assistsA gravity assist through a binary star system.

The Andromeda Galaxy and its satellite galaxies on the map — GalaxiesAndromeda. Its stars can be visited too.

The cosmic web of galaxy filaments around the Laniakea Supercluster on the map — Cosmic webZoom out far enough and the galaxies become a web.

See all the screenshots →

Questions

Is Rocket Foundry free?

Yes. The beta is free on Windows, Linux, Android and iOS.

What kind of game is it?

A 2D space sandbox and rocket building game. You design craft from parts, fly them with real orbital physics through a full-size solar system, and travel on to other stars.

Can I play with friends?

Yes. Share a Sandbox world with a room code or run the free dedicated server. Everyone flies their own craft in the same world, including in other star systems.

Are the planets procedurally generated?

The stars within 50 light-years are real, and more than 200 systems are charted by hand, about 90 of them with their confirmed planets. Every other star in the Milky Way gets a procedurally generated system that is the same for every player.

Can I mod it?

Yes, without code. Body Studio edits planets, moons and stars, and the part editor, moving-parts editor and Engine Lab create new hardware. Mods and whole worlds can be shared as files.

Free beta · Windows · Linux · Android · iOS

The galaxy is open.
Bring a rocket.

Download the beta, find a world nobody has visited yet, and invite a friend to fly it with you.

Download free Join the Discord ↗

Build a rocket.
Cross the galaxy.