SimpleRockets is back, but now it's fully 3D. Build rockets, airplanes, rovers, and anything you can think of with highly customizable parts. Explore 3D planets. Upload and share your crafts online. We're bringing it to Early Access while we work on a Planet Builder, Campaign Mode, and other key features.
Recent Reviews:
Very Positive (26) - 88% of the 26 user reviews in the last 30 days are positive.
All Reviews:
Very Positive (355) - 85% of the 355 user reviews for this game are positive.
Release Date:
Nov 8, 2018

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Now that we have a solid, fully 3D rocket simulator it's time to get the community involved. We have ideas for key features that we want to implement (such as a Planet Builder and Campaign Mode), but players have great ideas too and we want to include them in the development process and have time to react to those ideas.”

Approximately how long will this game be in Early Access?

“Our goal is to finish Early Access in 2019, though we are prepared to change this as we respond to player feedback.”

How is the full version planned to differ from the Early Access version?

“The full version will include more parts, more planets, and modding support. We also plan to add a Planet Builder where players can build their own planets and share them online. Another key feature of the game will be a Campaign mode, which will provide a means of personal progression. At this point, we're not sure exactly what form it will take, but this is one area where we will be relying heavily on feedback from Early Access participants to help mold the final product.”

What is the current state of the Early Access version?

“The game is already a robust 3D rocket and airplane simulator with over 30 parts, multiple planets, several challenges, and much more. Please see the game's description for the complete list of features.”

Will the game be priced differently during and after Early Access?

“We plan to gradually raise the price as we add new content and features.”

How are you planning on involving the Community in your development process?

“Players have great ideas and they're great at finding bugs, so we strive to make it as easy as possible for them to get in touch with us and contribute to the development process.

  • Players can submit their own ideas and upvote and comment on other players' ideas on our Suggestions page.
  • Forums - Steam Forums and the forums on are a great way for players to get in touch with us for troubleshooting issues.
  • Bug Reports - Players can submit bug reports from within the game and include a screenshot and description. The more information they provide the more it will help us to identify and fix the issue.
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Includes 2 items: SimplePlanes, SimpleRockets 2


Recent updates View all (30)

May 22

Beta version

A large part of this update was just below the surface, refactoring our old code and tackling some technical debt. Nathan took a quick hiatus from mod support to perform major surgery on the game loop and it has significantly improved performance for large craft. From our testing, we've seen an FPS increase of over 30% for some crafts.

I refactored all of the fuel code so that we could support some new features to give you more control over how your crafts consume their fuel (I mean propellant...sorry, Kell). Now you can re-prioritize your fuel tanks, drain from multiple tanks at once, and even automate fuel transfer using cross feeds, which are available on any new interstage part you pull out from the part list.

Kevin revisited the fuselage parts and rebuilt their meshes to remove unnecessary complexity and improve game performance, undoubtedly contributing to the 30% FPS boost I mentioned earlier. Then he went through all of the fuselage textures with a fine tooth comb and fixed issues with alignment that had cropped up in a few bug reports. After that, he freshened up the loading screens to be more reflective of the game's current state.

William added a new, resizable gyroscope part, so now your crafts don't need to have a command pod for that. The power of the gyro is based on its size. He also incorporated four new songs from Fat Bard (the music guys).

Philip has been working on procedural landing gear, but that didn't make this update. We are hoping to get that in the next update, in a few weeks.

Here are the nitty gritty details:

  • Added multi-directional RCS part.
  • Added gyroscope part.
  • Performance improvements. From our testing, we've seen large craft have up to a 30% increase in FPS.
  • New loading screens.
  • Docking ports can now be targeted, which makes docking a lot easier.
  • Added fuel tank priority so the player can change the order in which fuel tanks are drained.
  • Added fuel crossfeed option to side interstage part.
  • Allow draining from multiple fuel tanks at the same time when they are set to the same priority.
  • Added shortcut to open Performance Analyzer window in the designer. Bound to 'O' by default.
  • Added an option to disable ambient light attenuation in the game settings.
  • Added more music.

  • Added button to the Part Inspector to select a part's command pod during flight.
  • Display fuselage radius and length when resizing in the designer.
  • Added Propellant Mass to Performance Analyzer window in the designer.
  • The explode part button now must be clicked twice before actually exploding the part. Safety first.
  • Slightly increased the default ambient light in space.
  • Tweaked exhaust visuals for underexpansion and overexpansion.
  • Added a progress bar for fuel in the fuel tank inspector window.
  • Paint Emission Setting Now Allows 1% Increments.
  • Added tool-tips for replication/control options on command pod's flight scene inspector panel.

  • Fixed a bug where the center of mass of the craft would not update during flight in some circumstances.
  • Fixed a bug with opening a craft/sandbox via file associations resulting in launching the game but not actually loading the craft/sandbox.
  • Fixed a bug where rotating a part with the keyboard would sometimes rotate the wrong part.
  • Fixed a bug with overlapping text on the dummy inspector window.
  • Fixed a bug where engines would not continue throttling to last known throttle input after separating from their commmand pod.
  • Fixed a bug where the part shape tool would not hide its grid after the player had finished dragging with the mouse.
  • Fixed a bug where disconnected parts would show up in staging display in flight scene.
  • Fixed the rotation direction of the planet in the main menu :D
  • Fixed issue which can cause a craft to whip around after undocking if the current heading is locked.
  • Fixed visual tearing on orbit lines when moving camera very rapidly in map view.
  • Fixed bug which would occur when the current navigation target is destroyed.
  • Improved the handling of invalid part styles, preventing them from modifying the part style list of all parts of the same type.

  • The game occasionally hangs on exit.
  • Cross feeds are not included in delta-v calculations or active fuel levels. I'm not sure if they ever will, but I do plan to investigate.
  • Multi-directional RCS can malfunction if a new stage is activated while the RCS is receiving input. Quick Save and Quick Load should fix the issue if you encounter it before we fix it.
6 comments Read more

April 24

Our games are now free for education

Starting today, our games can be used for free for education. Educators now have access to download the Windows and Mac versions of SimpleRockets 2 and SimplePlanes (DRM-free) from our website and install them on any number of classroom computers.

We've heard many great things over the years about how teachers are using our games in the classroom. They lend themselves well to teaching physics concepts and students seem to enjoy them. Fundamental concepts such as velocity, acceleration, gravity, lift, drag, etc can easily be demonstrated with an airplane or a rocket hurtling through the atmosphere at hypersonic speeds and that has a way of grabbing and maintaining a student's attention. SimpleRockets 2 goes a step further and can demonstrate advanced concepts such as orbital mechanics and many other rocket science concepts.

If you are an educator, just visit this page and click the Submit Request button. After we review your request, you will be given access to the downloads page where you can freely download our games for Windows and Mac.

If you are a student, help spread the word and let your teachers know!
19 comments Read more
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About This Game

SimpleRockets 2 is a fully 3D space sim that lets you build rockets, airplanes, rovers, or anything you can imagine and explore highly detailed 3D planets. Sharing is a core concept in SR2 and it has built-in capability to easily share crafts and saved games with the community. With SimpleRockets 2, it is easy to get started, but advanced players can dig into technical details if they are interested in the math behind rocket engines and orbital mechanics. Included are 17 different challenges to put your creations to the test. This is actual rocket science! Join us as we enter Early Access and continue adding new features, such as the Planet Builder and Campaign Mode.

We want to make sure we are building a game that players will love, so if you have suggestions for the game, we want to hear them. Those who followed our work on SimplePlanes know that we are highly responsive to player feedback. We are taking this a step further with SR2 and have set up a Roadmap page to open up our development process and be as transparent as possible.

Build crafts by snapping parts together. Choose from the pre-built engines, such as the Mage, which is a powerful kerosene-fueled engine. Or choose the very weak, but highly efficient Ion Engine. Or you can dig deeper into the complexity or rocket science and design your own rocket engines. Choose from the eight available engine types, seven nozzles, and six fuel types. From there you can change engine size, nozzle length, throat radius, and chamber pressure, which allows for endless combinations of engines.

Use interstages to split your craft into multiple stages and piece together modular fairings to protect your precious cargo. Launch multiple crafts into orbit. You can dock with your existing crafts to build space stations, moon bases, refueling stations, etc. Take photos of your journey across the solar system with the built-in Photo Library tool.

Stretch and shape fuel tanks, wings, cargo bays, fairings, and nose cones with easy-to-use tools that help you create exactly what you want. Resize solar panels, wheels, pistons, shocks, etc to fit your needs. Paint your craft custom colors and tweak their reflectiveness, emissiveness, and texture styles.

Rocket science is hard, so you might run into the occasional, rapid unscheduled disassembly (i.e. explosion). It happens to even the most experienced rocket surgeons. Might as well embrace it and take advantage of the opportunity to snag some spectacular photos.

Orbits are realistically simulated and support time-warp so you don't have to wait several months to reach another planet. The Map View makes it easy to see your orbits and plan future burns, which you can use to set up future encounters with other planets or satellites.

The flight model dynamically updates drag and lift characteristics of your craft as it changes. Re-entry effects kick in when you're screaming through an atmosphere at hypersonic speeds. Be careful, because the excessive heat can cause those aforementioned rapid unplanned disassemblies.

Download from a huge collection of user-uploaded crafts and sandboxes on our website. Upload your own crafts and sandboxes and share them with the community. Rise through the ranks from a white level builder to a gold level builder and beyond.


  • Fully 3D Rocket Designer that allows building anything from basic rockets to very complicated multi-stage rockets, airplanes, rovers, satellites, robotic mechs, etc.
  • Simple to get started, but advanced players can dig into the technical details if they are interested in the math behind rocket engines and orbital mechanics.
  • Design custom rocket engines and jet engines
  • Designer has tools that make it easy to rotate, nudge, and connect parts.
  • Realistic rocket physics and orbital mechanics.
  • Over 30 parts, including fairings, retractable solar panels, rover wheels, engines, etc.
  • Highly procedural parts that can be resized and reshaped into endless combinations, such as the resizable fuel tank and the cargo bay.
  • Map View to navigate the solar system that displays predicted orbits and encounters.
  • Fully 3D, rotating planets that support water and multiple biomes, such as desert, grasslands, tundra, etc.
  • Persistent sandbox that retains your previous launches.
  • Players can upload their rockets and sandboxes and share them with other players.
  • Online community where players can upvote and comment on other players' content.
  • Several build and flight challenges.
  • Parts support textures, reflections, and custom coloring.
  • Flight model dynamically updates drag and lift characteristics of your craft as it changes.
  • Re-entry effects including visual effects and part damage from heat.
  • The Nav Sphere makes it easy to control your rocket's heading.
  • Custom Launch Locations allow launching from multiple places in the solar system.
  • Support for saving custom subassemblies.
  • Crafts can dock together in orbit and transfer fuel.
  • Built-in tutorials show you how to build a craft and how to achieve orbit.
  • Time-Warp allows fast forwarding while in orbit.
  • Ion Engine supports burning during time-warp.
  • Performance Analysis window makes it easy for advanced players to see how their craft's Delta-V, TWR, engine Isp, etc are changed as they build their rockets.

System Requirements

Mac OS X
    • Requires a 64-bit processor and operating system
    • OS: Windows 7 SP1
    • Processor: Dual Core 2GHz
    • Memory: 3 GB RAM
    • Graphics: SM4, 512MB VRAM
    • DirectX: Version 11
    • Storage: 1 GB available space
    • Requires a 64-bit processor and operating system
    • OS: Windows 10
    • Processor: Intel Core i5
    • Memory: 4 GB RAM
    • Graphics: SM4, 1GB VRAM
    • DirectX: Version 11
    • Storage: 1 GB available space
    • Requires a 64-bit processor and operating system
    • OS: macOS 10.11
    • Processor: Intel
    • Memory: 3 GB RAM
    • Graphics: Metal, 512MB VRAM
    • Storage: 1 GB available space
    • Requires a 64-bit processor and operating system
    • OS: macOS 10.11
    • Processor: Intel Core i5
    • Memory: 4 GB RAM
    • Graphics: Metal, 1GB VRAM
    • Storage: 1 GB available space

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