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:
Very Positive (466 reviews) - 94% of the 466 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,428 reviews) - 97% of the 31,428 user reviews for this game are positive.
Release Date: Apr 27, 2015

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Recent updates View all (32)

June 21

Kerbal Space Program patch 1.1.3 is now available!

Hello everyone!

The 1.1.3 patch is now available! We’ve taken our time over the past couple of weeks to tackle as many issues as we could in this patch and the results speak for themselves: close to 100 fixes have been logged compared to the previous version of KSP, and we even found time to hide something small in the game that we’re sure a lot of long time fans will appreciate!

Check out the full changelog at our Forums.

324 comments Read more

April 30

Patch 1.1.2 is now available!

Hello everyone!

We noticed a number of issues persisted through the 1.1.1 patch earlier this week. We’re releasing patch 1.1.2 to address these issues before we head off to a long overdue vacation for the next couple of weeks. Patch 1.1.2 addresses issues with the user interface and landing legs, amongst others.

Check out the full changelog on our forums.

The Patch will start downloading through your Steam client automatically.

173 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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Very Positive (466 reviews)
Overwhelmingly Positive (31,428 reviews)
Recently Posted
20.4 hrs
Posted: August 27
Kerbal space program without a doubt is one of the best space simulation games out there on the market, I got it when it was like $12.99 and I don't regret a thing. Now with a price tag of $49.99 KSP offers a huge plethra of cool parts and engines to play around with, the sky is the limit to this game. Overall KSP is a great and enticing game but it needs an okay PC to run it. I would recommend this game to anybody who enjoys space exploration and ones that love sandbox exploration!
Helpful? Yes No Funny
0.8 hrs
Posted: August 27
Welcome to Kerbal Space University! Full of fun and relaxation:

In the next couple of months you better get familiar with standard gravitational parameter, Kepler’s laws, geostationary orbits, Scott Manley, bus orbital characteristics, double impulse maneuvers, Hohmann transfer, orbit apsides, Bi-elliptic transfer, hyperbolic trajectories, ejection velocities, Δν impulses, marginal captures, aero-breakings, ballistic trajectories, ejection angles, thrust profiles for various solid rocket cores, Nitrogen tetroxide, advanced inline stabilizer, propelant flow rate... ... ...

Pretty cool, huh? Going to the Mun and more.
While listening to the masterpiece of Kevin Macleod!
Helpful? Yes No Funny
Dr. Kerbal
355.6 hrs
Posted: August 27
Perhaps the greatest game on the face of the planet. All hail our lords Jebediah Kerman and Scott Manley. 10/10 would do it for science again.
Helpful? Yes No Funny
Sir Top'em Hat
37.2 hrs
Posted: August 27
I built a ship which was equipped to go to Duna, however, on the return trip back, I forgot to bring a parachute.

R.I.P. Jeb Kerman. There are 47 Kerbals waiting for you in heaven.
Helpful? Yes No Funny
Marvenis Schmittus
108.9 hrs
Posted: August 27
This next game asked me not to post this but Goddammit it I'm gonna post it anyway, because I wrote it, and it's the truth:

I ♥♥♥♥ing love this game. It is the best game ever, period!

Ladies and gentlemen...

Helpful? Yes No Funny
POrtalGAte SD1
55.5 hrs
Posted: August 27
great game, it has one limit, your imagination.
you can send probes, or crewed missions to near by moons or far away planets, mine planets moons or even asteroids (which can be diverted to a near by Kerbin orbit to refeul your rockets.
Rockets not your style?
you can build aircraft to explore biomes, light fast jets, heavy long range cargo/passengerplanes land on the sea, on a montain can you take off again?
Helpful? Yes No Funny
Coyote Ugly
247.5 hrs
Posted: August 27
This is a truly unique game.

This is a truly infuriating game.

There's nothing I can say bad about this game because

1: I'd call it about 90% stable (compared to a bethesda game that's about 70%). This alone wouldn't matter. Just cuz the game loads and doesn't crash while you play it doesn't mean it's not bad. But for how much time the average Kerbal will play this game, it's a huge factor (Also, the game takes about 10 minutes to load if you have anywhere near 100 mods installed, like me.)

2: It's unique. There is no game like this. ANywhere. It simulates a solar system (simplified, of course, because truly doing this in real time is beyond any home computer.) so that you can build, fly and crash rockets, planes, boats and... anything. The limitations are almost nonexistent. Some youtubes build completely stock (No mods) helicopters even though there are no parts designed to build a helicopter.

3: You HAVE to think. You can slap rockets together and hope for the best and plenty of people have mastered this game from doing that. But if you don't learn and try, this game will lose appeal fast. If you manage to get over the steep learning curve, though, you'll never get bored of this game. Minecraft let you let your artistry go wild. This game will refine it into a diamond as you struggle to meld Form and Function into spacecraft that can literally go beyond the Moon. I can't be serious enough in saying that this is a truly fascinating and amazing game.

4: Mod support. There are mods that give you exactly the type of experience you're looking for. The stock game is wonderful and enough for most people to sink their teeth into for a good minute. If you want more, there are mods that enhance and maintain a stock-a-like experience and mods that add completely new systems.

Or bananas. Hell, there's a mod that lets you make a Hamburger that you can launch into space. Why? I dunno.

Anyways, this game is worth playing for anybody. It's unique, offers limitless challenge and, if you're patient, it will actually teach you about aerospace. It won't make you an astronaut, but if you show up to space camp after a few hundred hours of this game you'll definitely have some knowledge to show off.
Helpful? Yes No Funny
8.6 hrs
Posted: August 27
KSP is love, KSP is life.
Helpful? Yes No Funny
93.3 hrs
Posted: August 27
An interesting simulation with bad controls, and a physics engine that's been upgraded to "mostly okay."
The game is fairly enjoyable with simple ideas, but gets buggy way before you get to all of the most interesting parts.

Sadly, far more time is spent in the game fighting with (or looking up solutions to) the design system and bad controls than actually enjoying the game. Figure out what you want to do, then figure out why the game won't let it work, spend a few hours looking up and watching videos trying to figure out what the game wants you to do to achieve your goal, try and fail, watch videos and look on the forums to find out what they changed and the new solution, then actually maybe accomplish something. Rinse and repeat.

Trying to build a rocket (or worse - a plane)? Hope the game doesn't decide you want to install parts upside down or sideways. Once it's built, even using the in-game symetry system, the game might decide one side is heavier or less aerodynamic. Nothing will show up as being unbalanced, but you'll spin out of control until you take it all apart and build it the exact same way again. Any wheeled vehicle (rovers or rocket cars) will have a 100% chance of being unbalanced and making unplanned turns, assuming they don't explode first.

The collision detection will cause things to explode when they shouldn't, especially anything on or near the ground.

Once you manage to make orbit, you're expected to use waypoints you set by hand experimentally (they show you where you will end up if you've got enough fuel), in real time while flying. There is a way to remove waypoints when you've flown past where you wanted to be or the angle got screwed up, and it works almost half of the time if you keep clicking. I say expected to, because there are nearly-mandatory mods to automate the process. Any attempts to use the jetpack will result in only frustration.
Helpful? Yes No Funny
244.7 hrs
Posted: August 27
it's $20 today, what are you waiting for?
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
117 of 126 people (93%) found this review helpful
142 people found this review funny
118.4 hrs on record
Posted: August 12
Builds rocket that can leave launchpad

Forgets parachute

Builds rocket that can leave atmosphere

Forgets heatshield

Builds rocket that can go to the mun

Forgets landing legs

Builds rocket without forgetting anything

Forgets real life

Remembers parachute
Was this review helpful? Yes No Funny
99 of 115 people (86%) found this review helpful
58 people found this review funny
256.7 hrs on record
Posted: August 10
This game made me discover Scott Manley. 10/10 - Would discover Scott Manley again.
Was this review helpful? Yes No Funny
80 of 89 people (90%) found this review helpful
106 people found this review funny
2,014.9 hrs on record
Posted: August 12
Not sure if I'm into this game... Need to play a bit more to confirm...
Was this review helpful? Yes No Funny
62 of 71 people (87%) found this review helpful
62 people found this review funny
233.4 hrs on record
Posted: August 5
1 hour in: Bookmarked useful orbital manuvers...
10 hours in: Put sitcky note reminders on screen...
50 hours in: Doodled rocket designs on the back of any avalibe piece of paper...
100 hours in: Drew the Kebin system on desk for mission planning...
200 hours later: Wrote mission plans and equations on walls...

10/10 Would deface walls again.
Was this review helpful? Yes No Funny
43 of 47 people (91%) found this review helpful
45 people found this review funny
544.2 hrs on record
Posted: August 12
I've learned at lot more about space in this game than I did in school.
I also kept missing school because I was playing it instead.
Was this review helpful? Yes No Funny
22 of 22 people (100%) found this review helpful
3 people found this review funny
29.6 hrs on record
Posted: August 10
Ok, i've got lots of thinks to say about KSP, but I'll try to be clear, so let's begin!
This game nowadays is the best flight simulator i ever seen.
The potentials of this game are endless, you can do everything you want!
But this game wouldn't be the same without its community.
The KSP's comunnity is on of the best comunnity in the game's world!!
Seriously! I don't have many hours on the game (I hope not for too long ;) but i've never seen rude persons (yes, you'll say "This game is only Single Player!") but, trust me, the community is amazing!
I'd like to thank everyone who helped me when I started playing.
There are tons of useful mod, and if you have any questions, certainly there will be an answer in some forums or in some webpage.
Buy this game absolutely, specially if you are smart and you like to planning and studying the wounderfull game's mechanics.
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23 of 26 people (88%) found this review helpful
35 people found this review funny
218.2 hrs on record
Posted: August 1
Be Jebidiah Kerman
You cannot control your destiny
You ride rockets to infinity
and beyond you crash

Be Me
Build rockets that have no sense
Somehow it orbits
start the descent
heat builds
landing gear destroyed and lost to the inferno
deploy chutes
first chute gone lost in the flame
second chute holds but does not slow
third deploys
the last hope
hit the ground and the science pod explodes
but hey, Jeb is ok!
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18 of 20 people (90%) found this review helpful
4 people found this review funny
777.2 hrs on record
Posted: July 28
I have spent so much time on Kerbal Space Program. This is one game I keep coming back to after years of play. The sandbox nature of the game combined with the numerous parts available leads to endless possibilities for Rockets, Planes, Space Probes, Boats, Trucks, Cars, and really anything you can think of. Take the base game and add mods like Infernal Robotics and Tweakscale and you have so much more to do. Then add an additional 150 mods from CKAN and there is literally no end to what can be accomplished. 10/10
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19 of 23 people (83%) found this review helpful
12 people found this review funny
23.2 hrs on record
Posted: August 16
< Be me
< Download KSP
< Launch ♥♥♥♥♥♥ space shuttle
< Stage it incorrectly, first Kerbal dead.
< Google "KSP Tutorial"
< See Scott Manley KSP Tutorial for beginners
< Watch entire series
< Go back into game
< Im an expert now, NASA, sign me up
< Launch space shuttle, get into orbit
< Success
< Want to go to the Mun
< Go to the Mun after days
< Start to draw blueprints for space shuttles in class
< Come home, make shuttle, go to Mun once more.
< Bring home space rocks
< Apollo 18 all over again c;


< Want to go to other planet
< Make space station, modeled after the ISS
< Decide to actually buy game from steam

< Launch ♥♥♥♥♥♥ space shuttle.

11/10 - Would launch ♥♥♥♥♥♥ space shuttle again.

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11 of 15 people (73%) found this review helpful
10 people found this review funny
91.8 hrs on record
Posted: August 2
Yay! I'm a rocket scientist now.
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