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 (640 reviews) - 93% of the 640 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,077 reviews) - 97% of the 31,077 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.

290 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.

170 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 (640 reviews)
Overwhelmingly Positive (31,077 reviews)
Recently Posted
( 956.2 hrs on record )
Posted: July 30
TL;DR - Amazing game, buy it.

This is by far the best game I have played in decades. This is the game you grew up dreaming about.

This game is done incredibly well and is for all ages, I am 28 at the time of this review, and I have not stopped playing this game since I bought it over 3 years ago before it even came out on Steam. I have such a fondness for this game I have bought it repeatedly for several friends because it is that fun. Although it is a simulator, there is a hidden story throughout the easter eggs you find.

This game can handle a LOT of mods. I currently play with 50 mods and am always adding more. Using CKAN, it makes modding super easy.
Helpful? Yes No Funny
( 436.3 hrs on record )
Posted: July 30
Kerbal Space Program is basically just a game that will absorb and distract you from your life responiblities. If that's what you're here to do you should buy it, if not then buy it anyway because it's great anyway and you don't need a social life anyway!
Helpful? Yes No Funny
( 18.1 hrs on record )
Posted: July 30
Managed to make a ship that can go into orbit and return.

Made a sort range missle that works really well.

Currently working on an ICBM.

Want to make a colony ship.

10/10 would reccomend to anyone.
Helpful? Yes No Funny
( 34.9 hrs on record )
Posted: July 30
now on console
Helpful? Yes No Funny
( 533.7 hrs on record )
Posted: July 30
One of the best Space sim games really fun
Helpful? Yes No Funny
( 27.0 hrs on record )
Posted: July 30
I don't think I can add much that hasn't already been said about this beautiful simulation. It's a space program, you build rockets and satellites and shuttles and you wander in the solar system challenged by real physics and maneuvers learned at NASA.
What I will add though is that the game is great but not perfect. I feel like the developers really focused on making the best physics out there but forgot to cater a decent UI along the path.
Everything about the UI feels clunky and hostile to me, the maneuver planner is without a doubt the worst part of them all. You can't even pan the camera and are locked on the central axis of a planet, plus having to input the maneuver by dragging very small handles makes it all more difficult. And yes, I know I can use the scrollwheel and no, that sucks because its acceleration is unpredictable.
The game's UI basically rely on external mods to make the game pleasant, since there's a mod to help you inputting maneuvers.
Another issue I have are the graphics. Space is a fascinating place to be, but the Kerbal planet is so dull and empty and all the textures are badly scaled and even with a very old graphic card you can really max it out without a fuss, so it quite takes away from the immersion.
Bashing aside, the game is amazing and if only they'd hire a decent design team this game could really... soar over the sky.

+ it's the first ever, real space program simulation out there!
+ career mode is fun
+ you can build pretty much anything!
+ lots of mods

- career mode could be better
- huge lack of usable UI and design
- the game relies on mods too much
- you have to rely onan external wiki based on actual science to even reach orbit, while the game makes little efforts to help you get anywhere or teach you how to do it

it's been hell. until a month ago I couldn't even play the game because steamwas crashing every 10 minutes. then valve fixed it, I've been able to make an amazing config with touch menus, analog inputs, etc. and now playing feels great. The developer uploaded their own config, which is nice because the game actually swtiches between actionsets based on where in the game you are, but the actual config is a MESS. the basic keys like timewarp, map toggles, etc. are all over the place, in one actionset they're somewhere, in the next they're inside a shift key somewhere else on the pad. totally inconsistent and frustrating to use because when you jump between map and ship view you could (will!) accidentally trigger wrong commands looking for else. This definitely reinforces my perception that the developers are great at programming (REALLY great) but have no idea how usability works.

To conclude, the game is worth buying if you're into space sims and science, want to learn more on how an actual space program works and you have a massive amount of patience to learn the game. it will be rewarded!

Vote: 8/10
Helpful? Yes No Funny
( 122.5 hrs on record )
Posted: July 30
this game is Ram hungry with mods.

if you tend to be a heavy modder then I recommend that you have 12gb of ram or more

this game hard crashes if you run out of ram (this game can't use window's page file)
Helpful? Yes No Funny
Prime Time
( 55.2 hrs on record )
Posted: July 30
This game is superbly awesome and it'll get you interested about outer space if you're not. But you probably are since you're on this game's store page eh?

You could design any rocket ship or space ships that you can imagine(depending on your computer if you're planning on building humongous ships).

Sure there are crash bugs that's been going on since v1.1 but for the time it's not crashing, it's worth it and enjoyable.

The learning curve is quite high but not too hard that'll make you quit the game if you have enough patience to learn about the game. If you're still having trouble learning how to do this or that, I suggest getting the mod "MechJeb" and watch how it does its magic. Also, there are tons of tutorials all over the Internet, from Reddit to YouTube or on the Game's own wikia page and many more!

And a word of warning: This game can get a little frustrating as you watch in horror as your creations fall to the ground and explode. But the moment things finally go your way. It outweighs the frustrations you had to endure just to get it right. It actually makes the success a little bit more sweeter.

Then get frustrated again because your new rocket/plane design won't do what it's supposed to do.

So is it worth getting? Absolutely.

For full price? Definitely.
Helpful? Yes No Funny
( 360.2 hrs on record )
Posted: July 30
IF you never liked rockits then why whould you get this. Because it is one of the greatist games ever even if it cost $40 it is whorth it! P.S. when i got it in 2013 it was $15.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
105 of 108 people (97%) found this review helpful
27 people found this review funny
65.3 hrs on record
Posted: July 6
After my son had a really bad day where nothing seemed to go right, we had a talk about how failing is part of learning.

I said "Remember how you watched me flying rockets on the computer?"

He said "Yeah, they kept going all over the place and smashing into the ground! Have you landed on the moon yet?"

"Nope. Crashed into it a couple times. Learning new things every time though."

"Can I play that game too!?"

-Kerbal Space Program: Lessons for life.
Was this review helpful? Yes No Funny
109 of 120 people (91%) found this review helpful
206 people found this review funny
168.9 hrs on record
Posted: July 2
Still haven't successfully returned from anywhere but Minmus and the Mun.
RIP Jebediah I
RIP Jebediah II
RIP Jebediah III
RIP Jebediah IV
RIP Jebediah V
RIP Jebediah VI
RIP Jebediah VII
RIP Jebediah VIII
RIP Jebediah IX
RIP Jebediah X
RIP Jebediah XI
RIP Jebediah XII - Jebediah MMMMCMLXVII

Was this review helpful? Yes No Funny
41 of 53 people (77%) found this review helpful
19 people found this review funny
1,126.5 hrs on record
Posted: July 12
Why are you still reading reviews? Buy this game!
Was this review helpful? Yes No Funny
23 of 25 people (92%) found this review helpful
19 people found this review funny
62.6 hrs on record
Posted: July 22
After 60 hours:

-Can't oribit properly.
-Can't get to the mun.
-Can't do anything.

I love it. 10/10
Was this review helpful? Yes No Funny
15 of 15 people (100%) found this review helpful
2 people found this review funny
336.7 hrs on record
Posted: July 14
Kerbal Space Program

I started off with this game quite some time ago, back in the days when Kerbin was still neon green and all the fuel tanks were an ungodly blue color. I feel like the time has finally come for me to offer some decent feedback on this title, so that others know what to expect.

This game isn't very impressive visually, and while its art style is mostly consistent that doesn't change the fact that it suffers from both somewhat low resolution textures and a general lack of detail. For example, the lack of settlements on the Earth-analogue planet. I won't criticize it too heavily, though. While orbiting a planet or moon, the game does shine quite nicely - literally, as the sun rises over your celestial body of choice. Despite its flaws, it definitely gets the job done better than its closest relative Orbiter, and one should keep in mind that it is an indie title. There's enough detail here to be satisfied, and that's without installing modifications.

The in-game audio design is decent, but it gets repetitive eventually. The explosions are particularly satisfying. The music is calming, but also gets extremely repetitive after some time. I would suggest modifications, or to mute it and put your own music on instead. There isn't a ton to talk about here.

This game's performance has improved considerably lately. Previously, I would've had a bone to pick with Kerbal Space Program, but it has made a turn for the better in the past year or so. It still won't run on just any PC, but even unimpressive laptops can run it on low settings fairly comfortably. I should note that performance is highly dependant on what is currently happening in-game. If you construct a large ship, the framerate will drop due to physics calculations. Also, the newest version of the game has some issues with regards to bugs and glitches, so you might want to wait for another patch or else revert back to an earlier version via Steam Beta.

This title is in a league of its own with regards to gameplay. I'm still not sure that I've ever played anything like it. It features (mostly) realistic orbital physics and revolves around a sandbox building experience where you construct virtually anything - ranging from space shuttles to fighter craft to rovers... even to boats - out of rocket and aircraft parts. Some people will spend all their time using aerodynamics mods to create realistic aircraft designs, others will recreate historical rocket missions. Some might colonize another planet, and others might just spend most of their time crashing into the ground or fumbling as they try to understand how space really works. No matter what you like doing, there's almost certainly something for everyone with Kerbal Space Program. In my opinion, the only game that comes close to rivaling this title's gameplay is Orbiter, and that title is a much more in-depth space flight simulator that does not allow building your own ships out of different parts. Note that the game has no multiplayer as of this review's publishing.

Community Content
This game is absolutely phenomenal with its community content. From its humble beginnings, the aeronautical parts in-game were directly inspired by a modification, and the author of that mod was later hired by Kerbal Space Program's development team. There are now mods for everything. Realistic aircraft engines. Weaponry, ranging from machine guns to ballistic missiles. Careful recreations of historical spacecraft. Complete remakes of the physics system to be extremely realistic. In-game computer systems that will do things for you. Audio and visual modifications that completely change how the world looks. And, of course, complete overhauls to the Solar System, bringing things to the scale of real life. The game doesn't even have multiplayer, and someone took the time to code a fully functional mod to make it happen. The possibilities for community-driven content are endless in this game, and more is created every day.

This game is a perfect example of everything right in PC gaming, and is probably one of my favorite titles on Steam. I gained a better understanding of orbital physics from it than I did by reading about orbital physics in textbooks and encyclopedias, and I still marvel at all the possibilities in this game. It is simply incredible how it has progressed from its Early Access days, and despite its flaws, and the questionable decisions made by its publisher, it is a fantastic title that I recommend everyone try.

I recommend Kerbal Space Program.
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17 of 19 people (89%) found this review helpful
2 people found this review funny
22.0 hrs on record
Posted: July 1
A game for those with a more creative mind set. Set a goal and feel great once you hit it. Landing on the moon for the first time by yourself is as close to nirvana as you will get outside of finally downing that dark souls boss you couldnt beat.
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17 of 20 people (85%) found this review helpful
17 people found this review funny
214.8 hrs on record
Posted: July 11
Unsteadily launched a capsule into orbit, completed an orbit burn, did an EVA, got some science, prepared for re-entry, pitch, roll, turn to distribute the heat evenly on the heatshield, before the dawning realization hit -- I forgot the chute.

RIP Jebediah Kerman.

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13 of 19 people (68%) found this review helpful
18 people found this review funny
6 of 6 people (100%) found this review helpful
147.9 hrs on record
Posted: July 6
KSP is a space program sandbox with personality.

The core gameplay is solid and improves with every major patch - recent patches seriously improved the aerodynamics for example.

The game has some seriously hard parts such as in-orbit rendevous and docking - but there are lots of mods to help with this (MechJeb for example).

The best part about this game for me is that it feels like you have achieved something when you first manage to get into orbit, or first manage to get to the Mun.

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4 of 4 people (100%) found this review helpful
774.8 hrs on record
Posted: July 16
Fantastic game, in general. The game at first is very complex, and if you honestly don't have any past experience with applied physics, you might need/want to look up a lot of tutorials on YouTube (Scott Manley is your friend!). With 750 hours on the game currently, I still haven't done everything there is to do in the stock game, and with mods, you can make it as easy, hard, realistic, or fun as you want.

Though, for all players, new and experienced, I HIGHLY recommend pacing yourself. Go slow, don't travel to all the planets right away, because it is possible, but it's also no fun if you have no goals to set for yourself. I have over 700 hours on this game and I still haven't even tried to land a probe on Eeloo (farthest and most eccentric planet in the Kerbol system), so if you want to get the most fun out of this game, don't blow it all in one go!
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