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 (21,162 reviews)
Release Date: Apr 27, 2015

Sign in to add this item to your wishlist, follow it, or mark it as not interested

Buy Kerbal Space Program



Recommended By Curators

"A perfect blend of science and slapstick, and a robust and compelling sandbox of possibility. Simply outstanding."
Read the full review here.

Recent updates View all (18)

May 1

KSP 1.0.2 is up!

Hi again,

Just a very quick update this time, version 1.0.2 is now up:


v1.0.2 ==================================================

Bug Fixes and Tweaks:

* Fixed ships potentially overheating when splashed down.

* Small tweak to Mk16 parachute drag.

As always, you can get the latest version from our KSPStore, GOG, or get auto-updated on Steam.

Happy Launchings!


65 comments Read more

May 1

KSP 1.0.1 is Up!

Hi Again,

We've just published KSP v1.0.1. This is a small revision patch to address some of the most noticeable bugs we encountered since the release of 1.0.

Some of these we knew about for a while, but couldn't fix in time for the release (as we approach publishing time, the risk of code-breaking and delaying the entire release outweighs any benefits in the potential fix), others we found out about during the weekend livestreams, and some others we found from your own feedback.

This patch isn't meant to cover every single bug, of course, just the more relevant ones. We're going to keep on with the bugfixing and tweaking as we move into development of version 1.1.

You can check out the complete changelog in our forums.

As always, you can get the latest version from our KSPStore, GOG, or get auto-updated on Steam.

Happy Launchings!


44 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
    • Processor:Core 2 Duo
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Windows 7 or 8 64 bit
    • Processor:Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
    • OS:Snow Leopard (10.6)
    • Processor:Intel
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Yosemite (10.10)
    • Processor:Intel Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
    • OS: Linux (Most distros should work)
    • Processor: Core 2 Duo
    • Memory: 3 GB RAM
    • Hard Disk Space: 1.5 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:2 GB HD space
Helpful customer reviews
69 of 92 people (75%) found this review helpful
124 people found this review funny
6.8 hrs on record
Posted: May 2
An accurate depiction of ISIS's space program.
Was this review helpful? Yes No Funny
43 of 63 people (68%) found this review helpful
19 people found this review funny
13.3 hrs on record
Posted: May 3
Pre-Release Review
I torrented this game some while back,
It was that good, I went and bought it.

The moral of the story is piracy helps the game industry
Was this review helpful? Yes No Funny
12 of 14 people (86%) found this review helpful
1 person found this review funny
21.5 hrs on record
Posted: May 3
To begin, I guess I should give a short description: Essentially, KSP is a fairly realistic simulation game where you take control of and guide the nascent space program of a race of small green men and women from a planet named Kerbin. You will build your own vessels, choose your targets for exploration, colonization, scientific endeavor, etc, and blast off for space. The construction system is incredibly robust and fun to use, and, because of the level of customization available, tends to mean that no two ships will ever look or behave exactly alike. There are no food or oxygen or water needs on ships (several mods change this if you want), but the actual mechanics and physics of the game are convincingly accurate, and make for a, while unforgiving, very fun game, because the feedback is extremely consistent. A mistake will kill you EVERY time, unless something hilarious happens (this is actually one of the great parts of playing KSP).

I cannot say enough positive things about this game. I purchased this originally in April of 2013, before it was on steam, and only purchased it on steam now that it has officially released. KSP has few goals, and in sandbox mode, it has none, but goals are not the reason to play KSP. The first time I successfully put a Kerbal in orbit around his home planet, I was dancing around my dorm room, and the first time I landed a Kerbal on the Mun, I felt a sense of accomplishment I have quite literally never felt in a game before. Now, over the course of what must be at least a thousand hours of play, I have built massive colonies on Laythe, the Mun, Minmus, Duna, Eve, and even Ike, I've built huge orbital stations around various planets, and I've even built floating cities in the clouds of Jool and Eve through the use of just a few of the thousands of mods available. I've built resource collection and transport systems including storage, mining, and transport operations. I've explored hundreds of different areas with probes, landers, and vehicles, and yet, to this day, I still play this game at least two to three hours a week, and I'll go on KSP binges several hours long when I think of a new challenge to set for myself. Currently, a friend of mine and I are in a little friendly competition for who can build the most epic Duna colonization project. If you can't tell by now, if you want an 'on rails' game where everything is spoonfed to you, just leave now. This game is most certainly NOT for you. The contract system is honestly only there to give a person inspiration.

But if you want a game that throws challenges at you that will test every brain cell you have, and pound your face into the ground mercilessly if you make even the slightest mistake, then KSP is your game. And when you finally put a Kerbal safely on the Mun, you just might understand why so many people write such glowing things about KSP.
Was this review helpful? Yes No Funny
8 of 9 people (89%) found this review helpful
3 people found this review funny
4.2 hrs on record
Posted: May 3
A game where you go up, then down. Or you just end up exploding into a million little tiny pieces as the heat from reentry blows up your wings, your nose piece, your parachute, and then your cockpit goes KABAM on Kerbin's water.

Was this review helpful? Yes No Funny
6 of 7 people (86%) found this review helpful
2 people found this review funny
109.4 hrs on record
Posted: May 3
this game has a learning curve, but is extremely rewarding once you are able to get going.
Was this review helpful? Yes No Funny
8 of 11 people (73%) found this review helpful
20.7 hrs on record
Posted: May 3
Have not slept in two days, beware it's good.
Was this review helpful? Yes No Funny
12 of 19 people (63%) found this review helpful
1.5 hrs on record
Posted: May 2
i personally do not like this game, however i do recommend it because if you like space craft building sims then you will enjoy this. Great sim just im not the target audience.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
185.0 hrs on record
Posted: May 3
I can't describe enough how much this game is awesome. It is frustrating annoying and makes you cry, but first time you land on the moon you are hooked for life.


Srpski - ljudi igra je odlična, nećete pogrešiti sa kupovinom, isplati se svaki dinar.
Was this review helpful? Yes No Funny
4 of 5 people (80%) found this review helpful
1 person found this review funny
16.6 hrs on record
Posted: May 3
great game. many explosions.
Was this review helpful? Yes No Funny
1 of 2 people (50%) found this review helpful
89.9 hrs on record
Posted: May 3
Ok first off i do in fact recommend this game but i dont think that the "1.0" realease was quite as finished as i would hope. There is still some bugs that can drive a person mad. One being that sometimes as your fuel drains in your rocket or plane your control surfaces all the sudden invert their controls making sas harmful instead of helpful cause as it trys to turn right its infact turning left, you get the point. but most of all i wish this game would implement a better save feature. as it is now it only saves over top of one persistent file. that sounds great and all but its not for example all the ways this screws you over. you can make quicksaves just one to revert back to using f5 and f9 well if you load one and didnt try all progress after that gets reset because it autosaves and overwrites all the progress youve made. say you forget to make a quick save and mess up most of the time you have nothing to revert back to except something that could be 1 min before impact or what you messed up or it could be 1 hour they need to be more reliable ever 15 mins or so and they need to not save over each other and have it so that the autosaves build up so you have a set amoutnt then it deletes the oldest one to make a new one that would solve all of this.

p.s. yes this is alittle bit of a rage after i lost 5 hours of work because i accedently loaded a quicksave
Was this review helpful? Yes No Funny
752 of 763 people (99%) found this review helpful
83 people found this review funny
496.3 hrs on record
Posted: February 26
Early Access Review
1st hour playing: WHAT DO I DO WHY IS IT BLOWING UP
400th hour playing: If my calculations serve me right with this T/W ratio It will take me 1 minute 43 seconds to burn at my periapsis to reach duna insertion at which point I will get into an eliptical equatoral orbit and perform an aerobrake at 16km to get into a steady circular orbit and then I will descend with one of my 4 spaceplanes I took to go to the north pole at which I will set up base at my already existing rover while getting TAC resources to monitor life support and make sure my colony of 212 kerbals can live.


Edit because for some reason this gained popularity, proper review:

Endless fun, so much to do. Bored of building rockets? Build a space plane! Fed up of the mun? Go to Duna! Don't want to leave the atmosphere? Build whatever you want! The list goes on!

Fantastic modding community and fantastic mods. So much more expansion on an already amazing game.

Fantastic community in general, some of the nicest people I've met have came from this game. They are such a helpful bunch and I'm glad I'm with them! They'll most likely love to help you. There's also a bunch of fantastic YouTubers such as Scott Manley and others... (too many to name) :)

YOU CAN LEARN STUFF FROM THIS AND GAIN NEW INTERESTS! Before I played this I had no interest in space or space exploration whatsoever but now I actively follow space news and am quite knowledgable on the subject. I have also learnt a fantastic deal of orbital mechanics just from playing and learning the game.


The engine and optimisation. This game uses Unity and it only uses 1 CPU core. This can be a major problem if running a multicore with low clock speed. The 32bit version of the game is a whole lot more stable but limits your RAM meaning that if you have a ton of mods you can run into a lot of crashes but thankfully there are mods out there such as ATM (Active Texture Management) and texture replacer to limit the amount of RAM the game uses. 64bit as of now is still pretty unstable with mods.

The learning curve and tutorials. The learning curve on this game is huge, I'm not complaining much about this one as rocket science isn't exactly easy is it? You can learn from trial and error and it's how I learnt alot but some things you just have to read up about or watch a tutorial on youtube. There isn't really much of a tutorial in game either.

Conclusion: Buy it. It's really fantastic.
Was this review helpful? Yes No Funny
662 of 680 people (97%) found this review helpful
3 people found this review funny
402.4 hrs on record
Posted: December 8, 2014
To remove any doubts, this is by far THE best space simulator out there.
The Good
  • Amazing learning experience
  • Choose where you want to go, with what, when, and how.
  • HUGE planets to discover, literally, thousands upon thousands of kilometers to walk, drive, or fly your epic creations (or, if your not very creative, preset or other players' ships)
  • Create awesome rockets, landers, bases on other planets, and spaceplanes, the way you want them
  • Fun science mode to work your way up, earning "science" in order to get better equipment and rocket parts (I recommend for newish players who at least know how to get to the Mun)
  • "Creative" mode where all parts are unlocked (great for testing and trying new things)
  • "Career" mode for those really wanting a challenge (balance economy, science, and reputation for your own space organization, I recommend having a little more experience before jumping right in)
  • They are still adding to this game... several user created mods really expand on the experience
  • Built off of real physics! One doesn't just lop space junk up into the sky; one must deliver that space junk the actual way and make Kepler and Newton proud!!! (generally speaking, it allows one to see how actual launches and orbits work)
  • Many other great aspects to this game (however, this would be a long list with all of them)
The Bad
  • Graphics aren't the best, however, they are still good and create a real sense of depth and can deliver a "lost-in-space" kind of a feel... It makes me feel so small compared to the vastness of our world. Plus, the graphical style really fits the style of the overall game.

  • Somewhat steep learning curve- It took me a while to learn to get to the "Mun." After this achievement, it was a lot easier to get to Minmus after this. It was difficult to get to Duna, however, once I got there, I have gradually learned enough to go pretty much anywhere and have recently made a permanent base on Laythe complete with science lab, crew pod and now a brand spanking new air breathing engine jet transport, as well as a souped up Rover for them to drive. I have been to almost all of the planets. So basically, it takes time to get "good" at this game, but I assure you, it's rewarding and so spectacular to see how huge this world is (And this one is scaled down, too!). However, with the game out of Alpha, new tutorials should be very helpful for the beginner.

  • not too much music (it's still good, just gets repetitive sometimes)

  • Getting to further out planets can take a long time, because it is difficult and takes more resourcefullness... (several hours if your like me and really take your time, especially if you send a 3 manned mission to Eeloo...)

Overall, this is a wonderful simulator offering a lot of real science with fun, providing lots of hours of engaging gameplay. I am so happy the developers have successfully brought this amazing game out of beta. I have purchased this game so long ago, and the updates have vastly improved the game and have solved many of the problems I have dealt with. Thank you for reading this book of a review, and I hope this really helps. Feel free to leave a comment if you have any questions, I have over 350 hours logged and played the demo for several hours. I will try to get to them as soon as possible. Happy Kerballing!!!
Was this review helpful? Yes No Funny
901 of 944 people (95%) found this review helpful
86 people found this review funny
78.2 hrs on record
Posted: April 27
This game should be standard issue in school physic classes. Taught me more about orbital mechanics than anything else.
Was this review helpful? Yes No Funny
2,028 of 2,198 people (92%) found this review helpful
106 people found this review funny
167.8 hrs on record
Posted: December 1, 2014
Early Access Review
If I had this in 4th grade computer lab instead of Oregon Trail I would be an astronaut right now instead of dying of dysentery.
Was this review helpful? Yes No Funny
329 of 334 people (99%) found this review helpful
14 people found this review funny
112.7 hrs on record
Posted: November 23, 2014
Early Access Review
If you have a deep longing to attempt landing on the surface of a star, or the gumption to fling countless people into space without any consideration toward their lives, then this may be the game for you. Failure is the only option.

Most of your best stories will have nothing to do with what went right on a standard planet-to-planet maneuver, or how you really nailed that Hohmann transfer. No, it'll probably be the flaming wreckage you created where no one should have survived, but somehow did. My game once glitched as a Kerbal was falling from the upper atmosphere and he bounced on the surface. He bounced! And not in the crumpled heap of flesh and bone matter way. He bounced off the ground and appeared to be coming in for a graceful finish to a mission gone horribly wrong--the only type of mission that truly exists. He fell from space! And lived! Forget space, erect a statue!

My first manned mission to the Mun ended in predictable failure. I tried landing without any sort of landing gear. How, you might ask? By landing on the engine so it was primed for vertical takeoff. I forgot about my horizontal velocity, however, and ended up ripping the engine apart. I had all the fuel I needed for a return mission, but the broken engine was left kilometers away. Oops. At least I could plant a cool flag.

I attempted a rescue mission, because that is the first irresponsible thing everyone always thinks to do: stranded person in space? Send more people to help them! The first mission collided with the Mun at 600 m/s. Rough landing. The second mission landed, but I was probably 50km away--which isn't all that bad, all things considered. I had the stranded Kerbal run toward the landed ship, but it was taking forever. So I started using his little jetpack to expedite things. Lemons and lemonade. As it turns out, you can actually disintegrate a Kerbal if you get too much forward momentum and collide with something solid, like the surface of the Mun. You will forever be in our thoughts, Mac Kerman.

So much for the rescue. I may as well have the rescue team return safely. Remember that landing gear part? Yeah, I still hadn't updated that section of the ship. Instead I landed on my side and planned on using elevation as a natural ramp. Bulletproof logic. At least this Kerbal had the dignity of a fiery, fiery death. An honorable death. By my own hands.

In KSP, your little Kerbal guys can die and be listed in the ambiguous "Lost" column. It was with great sorrow that I saw Mac Kerman's name in there. I didn't care so much about the other guys. Who cares about the second guy on the Mun? But here's the thing, several years into my career mode Mac magically reappeared and was ready for action! He came back from the dead! And what was the first thing he wanted to do? Go back into space! To die again!

In conclusion, yes to this game. Just yes. I currently have a Kerbal orbiting the second moon, Minmus. Yes, he is in a stable orbit without a ship. Just him. And he's been there for close to 30 years now. I'll get around to that at some point.
Was this review helpful? Yes No Funny
1,802 of 2,023 people (89%) found this review helpful
59 people found this review funny
85.3 hrs on record
Posted: December 20, 2014
Early Access Review
An Incredibly realistic depiction of North Korea's space program.
Was this review helpful? Yes No Funny
958 of 1,074 people (89%) found this review helpful
44 people found this review funny
720.7 hrs on record
Posted: April 27

Ruined Science Fiction Movies with now learnt knowledge of real-life Astrophysics
Was this review helpful? Yes No Funny
616 of 680 people (91%) found this review helpful
34 people found this review funny
5.6 hrs on record
Posted: November 8, 2014
Early Access Review
6 Banned words in the NASA : "It worked in Kerbal Space Program."
Was this review helpful? Yes No Funny
431 of 475 people (91%) found this review helpful
3 people found this review funny
51.3 hrs on record
Posted: December 12, 2014
Early Access Review
I've learned more about orbital mechanics in a few hours of playing this game then my entire life up to this point. Very cool.
Was this review helpful? Yes No Funny
317 of 346 people (92%) found this review helpful
21 people found this review funny
32.1 hrs on record
Posted: April 9
Early Access Review
have major science test tomorrow
screw studying
play KSP for 12 hours
Test rolls around
Ace it with 105% (bonus points)
only person in school to do this
teachers asks how
say that Jeb helped me
she asks who Jeb is
look her in the eyes

he's a badass


No really. Get the game. It's amazing. (I acutally did ace that science test)
Was this review helpful? Yes No Funny