Kerbal Space Program has left Early Access. 1.0 comes packed with new features, optimizations, bugfixing, and tons more! Conquering Space Was Never This Easy!
User reviews:
Overwhelmingly Positive (406 reviews) - 95% of the 406 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,230 reviews) - 97% of the 31,230 user reviews for this game are positive.
Release Date: Apr 27, 2015

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Recent updates View all (34)

September 13

Update 1.2 Pre-release is here!

Hello dear Kerbonauts!

Update 1.2 has finished its Experimentals phase and we’re excited to announce the launch of the Public Pre-release.

During Experimental testing a small team of experienced KSP players threw everything they’ve got at the game in order to help us catch as many bugs as possible, so that we could make the game as stable as it could be. Now we’re proud to say that’ve come to the point where we can finally release the open test build.

This ‘pre-release’ test build is for everyone to have a go before we officially released the update and you’ll be able to opt-in to get the Pre-release builds via the Steam betas, or, for the first time ever, through the KSP Store. Naturally, you’ll need own a copy the game beforehand in order to access these builds. This opt-in branch will run for a minimum of two full weeks before the release date of the final update (the final release date hasn’t been closed, so changes may occur).

To facilitate discussions of the Pre-release branch we’ll be opening up a temporary sub-forum for feedback. Additionally, a Pre-release project will be made available on the bug tracker to report bugs on.

Furthermore, we want to help the modding community by making the modding API public. Click this link and enjoy!

Finally, and as promised, you can get Porkjet’s awesome rocket parts package files here .

We’re almost there and we couldn’t be more excited. Stay tuned for updates and happy launchings!

230 comments Read more

September 5

Update 1.2 has entered Experimental testing!

Hello Kerbonauts!

Update 1.2 has just entered Experimentals! We’re eager to finally start the next phase of testing and getting ever closer to the 1.2 release.

During experimental testing a crack team of experienced and hand-picked KSP players will throw everything they’ve got at the game to make it bend, blend and break in many ways. The goal is to catch as many bugs as we can, and to make the game as stable as it can be before we make a public test build available.

Those of you who’ve been around for the 1.1 update will remember that we released a ‘pre-release’ test build for everyone to have a go before we officially released the update, and for update 1.2 we plan to do the same thing. Once the pre-release builds are available you’ll only be able to opt-in via the Steam betas, or through the KSP store.

We hope you’re as excited as we are about the coming weeks. Stay tuned for updates and Fly Safe!

209 comments Read more

About This Game

In KSP you must build a space-worthy craft, capable of flying its 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 offers three gameplay modes: Sandbox, in which you are free to build anything you can think of; Science Mode, which lets you perform Scientific experiments to advance the knowledge of Kerbalkind and further the available technology; and Career Mode, in which you must manage every aspect of your Space Program, including administration strategies, Crew Management, Reputation, as well as taking up Contracts to earn Funds and upgrade your Space Center Facilities (or repair them).

Add to this the ability to capture asteroids (a feature done in collaboration with NASA), Mining for resources out across the furthest reaches of the Solar System, Constructing Bases and Space Stations in and around other worlds; plus literally thousands of mods from a huge active modding community, all add up into the award-winning game that has taken the space sim genre by storm.

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.
  • Take on Missions to attract interest in your Space Program.
  • Discover new worlds and expand the scientific knowledge of Kerbalkind.
  • Extract valuable resources from all over the solar system.
  • And a whole lot more!

System Requirements

Mac OS X
SteamOS + Linux
    • OS:Windows Vista or 7
    • Processor:Core 2 Duo
    • Memory:3GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:4 GB HD space
    • OS:Windows 8 or 10 64 bit
    • Processor:Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:6 GB HD space
    • OS:Mountain Lion (10.8)
    • Processor:Intel
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:4 GB HD space
    • OS:El Capitan (10.13)
    • Processor:Intel Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:6 GB HD space
    • OS: Linux (Most distros should work)
    • Processor: Core 2 Duo
    • Memory: 3 GB RAM
    • Hard Disk Space: 4 GB HD space
    • Video Card: SM3 512MB VRAM
    • OS:Ubuntu 14.04
    • Processor:Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:6 GB HD space
Customer reviews
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Overwhelmingly Positive (406 reviews)
Overwhelmingly Positive (31,230 reviews)
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24,914 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
89 of 99 people (90%) found this review helpful
84 people found this review funny
43.9 hrs on record
Posted: September 4
A wise man once said:

"If at first you don't succeed, add more mainsail thrusters."

This man was correct.
This man was me.
Was this review helpful? Yes No Funny
70 of 75 people (93%) found this review helpful
53 people found this review funny
296.5 hrs on record
Posted: September 1
Top 5 things that taught me orbital mechanics:

5. Apollo 13 (1995, Tom Hanks, Bill Paxton, Kevin Bacon) ~$13 []

4. Highschool Physics (Newtonian Mechanics) ~Free [Australian Education System]

3. Undergraduate Physics Degree (Keplerian Motion, One body mechanics) ~$8000 /year [UQ]

2. Postgraduate Physics Degree (Analytic two-body solutions, computational Runge-Kutta simulations) ~$10000 [UQ]

1. Kerbal Space Program ~$30
Was this review helpful? Yes No Funny
33 of 34 people (97%) found this review helpful
21 people found this review funny
297.7 hrs on record
Posted: September 13
Nothing will prepare you for the moment you first touch down on the Mun with your Kerbals - alive. The sense of accomplishment is magnificent.
Its probably comparable to the crushing defeat you feel as you realize you forgot to make sure you had enough fuel to get back home.
But! You've done it! You managed to get your Kerbals to the Mun, land them safely, lift off and get into an aerobrake orbit around Kerbin!
Aaaand, you forgot to put parachutes on your command pod :|
Was this review helpful? Yes No Funny
39 of 48 people (81%) found this review helpful
30 people found this review funny
6.3 hrs on record
Posted: September 5
Launched rocket; watched it explode.
Made adjustments and launched rocket; watched it explode.
Made more adjustments and launched rocket; landed it successfully. Watched science explode.

10/10 Michael Bays.

You should definitely buy this game if you like physics and explosions.
Was this review helpful? Yes No Funny
63 of 88 people (72%) found this review helpful
81 people found this review funny
14 of 16 people (88%) found this review helpful
16 people found this review funny
261.2 hrs on record
Posted: September 16
Harder than dark souls.
Was this review helpful? Yes No Funny
9 of 9 people (100%) found this review helpful
469.1 hrs on record
Posted: September 25
Kerbal Space Program, at least to me is the king of simulation games. While I play numerous others (such as Farming Simulator) they don’t seem to hit every mark in that field. KSP, while challenging at first is the one that throws everything that happens in reality at the player, and force them to deal with it. While a game like Farming Sim only really requires you to keep an eye on fuel or some crops, KSP requires that you maintain a healthy supply of necessities ranging from fuel and electricity, to a satellite connection back home. But the part of the game that truly shines is the feeling you get when you first land on the Mun. A friend who gave the game a shot said
“it was just...pride. So many Kerbals died in previous attempts, and I finally made it.”

While the game is difficult, I can’t stop asking people to try it. To me, it’s the perfect “life isn’t about the destination, but the journey” and I think this game captures that perfectly.
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7 of 7 people (100%) found this review helpful
44.5 hrs on record
Posted: September 21
As goofy as the game seems, you will NOT find a more in depth and accurate space flight simulation out there yet.

At first, it's fun to build explosive and cobbled together monstrosities to launch into space and send crashing back to the ground, but then you learn the basics. Then suddenly a successful Mun landing becomes a point of pride and the next planet over becomes your new goal.

The career mode starts you with simple parts, to be expanded through scientific discoveries and contractual financial incentives.

Jebediah recommends this game to anyone worth their salt in a tin can floating among the stars.
Was this review helpful? Yes No Funny
7 of 7 people (100%) found this review helpful
1 person found this review funny
14.0 hrs on record
Posted: September 18
And they say minecraft is educational. No, THIS is educational, orbital mechanics, maths and lots of fun.
Was this review helpful? Yes No Funny
6 of 6 people (100%) found this review helpful
4 people found this review funny
1,379.1 hrs on record
Posted: September 28
Just remember to eat and drink occasionally.
Was this review helpful? Yes No Funny
Recently Posted
Chris Lumley
86.4 hrs
Posted: September 30
The most fun I ever have. Be careful with how many mods you add on, because it can beef up system requirements pretty quickly, and if you do it without CKAN you can screw some things up. (I've had to uninstall and start over twice because I'm an idiot and ruined my files.) A great opportunity to learn about some real principles in rocket science while still being goofy and having a ton of fun. 10/10
Helpful? Yes No Funny
504.9 hrs
Posted: September 30
You ever wonder what people mean when they say "It's not rocket science"?

Wonder no more.

This game is all about rocket science. Put in about 500 hours and when someone says "its not rocket science" to you, you can retort with "i know rocket science and im about to show you how much Delta V it takes to crush your kerbals with my boot."
Helpful? Yes No Funny
315.8 hrs
Posted: September 30
Best game ever!, try to challenge yourself to reach the stars. I rate 10000/10
Helpful? Yes No Funny
424.9 hrs
Posted: September 30
Do you like planes? Helicopters? Boats, cars, and, of course, spaceships? Of course you do. Or, at least, you think you do, which is why you're reading these reviews right now.

I haven't done anywhere near everything you can do in this game. Hell, 90% of my time is spent making and toying around with fighter jets with weapons modded on to them.

The reason I love Kerbal Space Program is because it's possible to do just about anything you set your mind to, especially with mods.

The fact that Squad have kept up their work with this game even well after the official release, and engaged with the community all the while, is a model for any aspiring game developer to follow.

Do yourself a favor: Buy Kerbal Space Program. Because everything is possible. And I do mean everything.
Helpful? Yes No Funny
Health Inspector is Love
0.8 hrs
Posted: September 30
Helpful? Yes No Funny
1,125.1 hrs
Posted: September 30
No pew-pew, only space and sience. Shut up and take my money! Eh, and where is the donate button?
Helpful? Yes No Funny
268.6 hrs
Posted: September 30
Amazing game. Cannot recommend enough!
Helpful? Yes No Funny
32.4 hrs
Posted: September 30

You learn more about physics trying to get to orbit and land on the moon then in a physics class,
or you just added MORE boosters till it made it there.
Helpful? Yes No Funny
354.5 hrs
Posted: September 30
When I am writting this review, Steam shows 354 hours in game. However due to DRM free and moding, I already spent 1400+ hours (KSP is DRM free and is modable - so I play from non Steam-connected copy which is of stable version and specified mod mix - that is why). And I am counting.

What is this game about? Sending green folk (called Kerbals) to space and to another planets. For science. And having TONS and TONS of fun. Well, in case you like rockets, planes, space and explosions. In whatever order. It is so hard to describe the game I advice you to give a check to youtube - e.g. Scott Manleys channel will give you nice view into what KSP is about.

I bought this game back in 1.0.5 (32bit only) only out of boredom and to satisfy my game hoarding habbit. What I buy I do try - so I gave it a quick look before just adding it to my library. I tried to launch a rocket (I was unaware of contracts that time) - the chute deployed instead of expected fireshow. Some testing revealed the problem. I launched Jebediah and landed him back... It was kind of fun... Can I make it to orbit?

After couple hours at 3 AM (working day followed) I maintained very odd, but stable orbit. I literally danced at my darkened man cave-corner. For two weeks straight, I slept only 4 hours a day. I designed rockets in my head while driving, or falling asleep, I was making sketches of new projects while waiting for a meeting at work, I was (and I still am) proactively looking for books and documentaries to study or inspire myself. I have a time to play at PC only around 4 hours a day at max, but KSP takes much much more hours per day. In times before KSP, when on toilet, I would check the smartphone for funny gifs to have some giggles. Now, I am all about space exploration...

In those two weeks I found out I was wrong all my life about microgravity, orbital manneuvers and ascends of rockets. I was actualy learning stuff and I had great time doing so. Then I found out mods. It was like Christmas. Then a 1.1.x versions came and we received completely new engine, 64bit support. I fel in love with superfriendly community around KSP.

And all it took, is lego based rocket building. Behind simple concept of straping a big fuel tank and engine under a crew module lies very complex mechanics of orbital physics. I droped my dream to be an astronaut at age of 5 (bad memory of kindergarden "event" - so I am sure). After more than 20 years later, I am back :)

You can be new Elon Musk, or a reincarnator of Neil Armstrong. Or would you rather be Werner von Braun? You can be all of this. You can build rockets, planes, rovers, or any mad creation of yours (Kerbal mixer to mix actual Kerbals). ANd with mods, you can do really anything. Game can be easened (assisting mods), widened (parts mod, more planets) turned realistic (RSS/RO) and much more.

Well... long text and no actual review of what this game is. Sigh... Ok, go to youtube, check Kerbal Space Program... Does it seem funny? Give it try. I did and it is best game purchase I ever did. I already can play other games, and not touch KSP for two or three days. But I still play, and I still do enjoy it beyond I ever imagined.

Helpful? Yes No Funny
17.9 hrs
Posted: September 30
Best aviation/ aerospace engineering and space simulator out there. Great performance, amazing graphics, and good developers.
Helpful? Yes No Funny