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Kerbal Space Program is a multi-genre game where players create their own space program.
Release Date: Mar 30, 2013
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Early Access Game

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

Learn more about Early Access.

What the developers say:

“KSP is still under development. This means the game will be improved on a regular basis, through updates that add new features, content and bug fixes, so make sure to check back for new versions.



The game is being built as a sandbox first, so there are no objectives yet, but we want you to try it out and have fun with it already. You're free to build anything you can think of, and there is an entire Solar System to explore.



During development, KSP is available for purchase at a discounted price, which will gradually increase up to its final retail price as the game nears completion. So by ordering now, you get the game in its current state, and you'll get all future updates for free.”
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$26.99

Recent updates View all (10)

KSP: Asteroid Redirect Mission is Officially Released!

April 1st, 2014

Hi,

I'm very happy to announce that the Asteroid Redirect Mission patch for KSP is now officially released!




This is a very special update in many ways, not least of course is that it was made in collaboration with NASA, to make sure our Kerbal version of the Mission was not only true to its real-life counterpart, but that it was also fun, educational, and in keeping with KSP's style, free to be performed in any way you can think of. Want to re-enact the exact mission profile NASA is planning? Go for it. Want to send up enough rocket fuel to lift an office building and slam on the retrograde brakes? That's also an option. Want to not do any of those things and just use the Advanced Grabbing Unit to choose which Kerbals go and which stay? Erm... sure.

This has been, without question, the largest update we've ever done, not just in terms of development time, but most importantly in terms of the scope of the changes made. No other update has had so many different areas improved on at the same time. We usually focus on a single area to work on, but this time, we really felt the need to make a noticeable improvement in the overall playing experience, especially around flight planning and advanced deep-space missions.

So, Here are the highlights for this update:

* Asteroids:
Kerbin is no longer alone in its orbit. Nearby are countless objects that buzz in and out of its sphere of influence, some flying by harmlessly, others on impact trajectories. Ranging in size from just a few meters through 5 size classes up to gigantic objects weighing thousands of tons, these new objects should provide a new challenge for both new and veteran players. Each asteroid is procedurally generated, so no two are the same. Also, asteroids can have samples taken from them by EVAs, providing a constant source of valuable science data, right on the edge of Kerbin's SOI.

* Object Discovery and Tracking:
Before you set out after an asteroid, you first need to identify and track them using the Tracking and Discovery features on the Tracking Station Facility. Select one of the unknown objects spotted near Kerbin, and start tracking it actively to reveal more information about it. Also mind that untracked objects can be lost if they're left unobserved for too long.

* The Advanced Grabbing Unit (aka "The Claw")
As the name probably implies, this new part is the means by which asteroids can be captured to be redirected. Just arm the device, approach the target carefully, and the claw will do the rest. It's like a docking node, but without the need for a mate node on the other side. Better still, the AGU can be used to grab on to much more than just asteroids. In fact, it can pick up just about anything, even Kerbals.

* New SLS-inspired Size 3 parts:
We've added a host of new parts, featuring the largest engines and fuel tanks ever seen in KSP. These new parts were designed based on NASA's upcoming Space Launch System, and they pack a huge amount of rocket power.

* Completely Overhauled Part Joints:
We have completely re-done the way parts attach to one another, to allow for much greater flexibility and control over each joint. Joints are also more accurate and stable, as both jointed sides are now anchored at the attachment node (this wasn't possible before the Unity 4.3 update).


There's more. This update also features a host of small, and some not-so-small tweaks and improvements to usability, giving many features added a good while ago a much needed refurbishing, and adding a lot of the little things we never got a chance to add when we first implemented them.

Check this post for the complete changelog

Release Notes:
* The ARM Patch (0.23.5) should not break backward-compatibility with previous saves. That said, however, do mind that we cannot account for mods, so don't expect them all to work perfectly. If you experience any problems, make sure you try a clean install of the game without any mods, and a new clean save as well.

* The ARM Patch is available just as any other update. You should be auto-updated next time you run the game. Just make sure you haven't disabled Steam's auto-update system for KSP.


Happy Launchings, and have fun!!

Cheers

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KSP 0.23 Is Live!

December 17th, 2013

Hi,

Just in time for the holidays! I'm very pleased to announce the 23rd update to KSP is now available.



This update, as you all probably already know, was mainly focused in smoothing out the features we've added all through this year, patching up long-standing bugs, doing optimizations, and adding a few new features that were long awaited.

More Specifically:

* The Science Archives:
Browse through all the science you've done in your Career games in this new section of the R&D Facility.

* Tweakables:
Several parts can now be tweaked individually by right-clicking them during construction, allowing for entirely new possiblities in spacecraft construction.

* Science Revisited:
We've revised the way experiments are performed, stored and transmitted based on the feedback we got from the last release, to make Science much more engaging and interesting. Endlessly-repeatable transmissions that would let you max out a subject in a single mission are a thing of the past now.

* The Lab Module:
With experiments and transmissions no longer being freely repeatable, we've added the Lab Module to let you process your science data on the field, increasing the science gained by transmitting it. The Lab also allows you to reset single-use modules such as the Goo Canister and Materials Bay, since those will now become inoperable if their data is removed for transmission.

* The R.A.P.I.E.R. Engine:
The new 'Reactive Alternate-Propellant Intelligent Engine for Rockets' is a hybrid propulsion system that can run on external intake air while flying through the atmosphere, and will switch to internal oxidizer supply as you leave the atmosphere behind.

* EVA Data Collection:
Kerbals on EVA are now able to collect and store data from experiment modules and other science containers, including other EVAs.

* Part Tooltips Overhaul:
The old tooltips seen when hovering over part icons in the R&D or construction facilities have been completely overhauled. The new layout is a lot easier on the eyes and organizes information much more efficiently, making it easier to compare stats between parts and seeing what does what.

* All-Around Optimizations:
We've gone over a huge amount of code this time, to make sure the game is doing things as efficiently as possible. The optimizations were mainly focused around sources of lag with high part counts, so the game should be smoother around large ships. (Your mileage may vary, as no hardware setup is quite the same).

* 6-DOF Device Support for Windows:
Few games can benefit from a 6-degrees-of-freedom input device such as the Space Navigator like KSP. Seamless transition/rotation camera control on all scenes, plus pitch-roll-way and linear XYZ inputs in flight control mode, allowing for an unprecedented level of control. This feature is Windows-only for the time being, but we're ready to implement OSX and Linux support as soon as the drivers become available.


Plus a heap of other additions and fixes. Check out this article for the complete changelog.




Steam players should be automatically updated. (Might be a few minutes. Restart Steam if it's taking too long).


Compatibility with previous versions:
We haven't had to bump the last-compatible versions on this update, so all previous saves and craft files should work just fine through the update. Do keep in mind mods may not work correctly, so it's always advisable to start out with a clean, unmodded install.


Happy Launchings, and Happy Holidays!

Cheers

132 comments Read more
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About the Game

Kerbal Space Program is a multi-genre game where players create their own space program.


In KSP, you must build space-worthy craft, capable of flying your crew out into space, without killing them. At your disposal is a collection of parts, which must be assembled to create a functional ship. Each part has its own function and will affect the way a ship flies (or doesn't). So strap yourself in, and get ready to try some Rocket Science!


The game is being built first as an open sandbox, you're free to build anything you can think of, and fly it wherever you want, even into orbit and out to other planets and moons throughout the Kerbal Solar System. The first draft of the career mode is also available now, it is still in development, so expect more features!

Key Features


  • The Vehicle Assembly Building and the Space Plane Hangar allows players to build spacecraft out of any imaginable combination of parts.
  • Fully-fledged, Physics-based Space Flight Simulation ensures everything will fly (and crash) as it should.
  • Take your Kerbal crew out of the ship and do Extra Vehicular Activities.
  • Fly out to Moons and other Planets.
  • Procedural Terrain delivers detailed terrain at a vast scale. The Kerbal Planet is 600km in radius!
  • Mod-enabled, allows players to create new content and modify the game.
  • Ship systems. Keep an eye out for engine temperatures and fuel levels, and try not to explode.
  • Build ships with multiple stages, and jettison parts away as they burn out.
  • Full control over the ship’s setup allows for complex ships and advanced functionality.
  • Dock spacecraft together to build Space Stations, Massive Starships, or even surface bases on other worlds.
  • Manage your crewmembers, hire them, and send them out into space and make them into heroes.
  • Research and Develop new technologies to advance your Space Program.

Planned Features


  • Take on Missions to attract interest in your Space Program.
  • Discover new worlds and expand the scientific knowledge of Kerbalkind.
  • And a whole lot more!

PC System Requirements

    Minimum:
    • OS:Windows XP
    • Processor:Core 2 Duo
    • Memory:2 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    Recommended:
    • OS:Windows 7
    • Processor:Core i3
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space

Mac System Requirements

    • OS:Snow Leopard
    • Processor:Dual Core Intel
    • Memory:2 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space

Linux System Requirements

    • OS: Linux (Most distros should work)
    • Processor: Core 2 Duo
    • Memory: 2 GB RAM
    • Hard Disk Space: 1.5 GB HD space
    • Video Card: SM3 512MB VRAM
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