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 (21,992 reviews)
Release Date: Apr 27, 2015

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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!


110 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!


55 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
230 of 233 people (99%) found this review helpful
2 people found this review funny
806.8 hrs on record
Posted: April 28
There are no other games really like this. You will, in a terribly entertaining way, learn some fundamental of orbital mechanics, rocket science, aerodynamics, astrophysics and even a bit of mechanical engineering and straight physics.

There is nobody to shoot, no zombies, no monsters, no combat. No grand conquests and raising flags over captured enemy bases. Yet you have never and will never play a game that will challenge, entertain and reward you like KSP will. The learning curve is stiff but not terrible. You play it at your own pace because, well, there is no other pace you can play it at. Games like Dark Souls are 'hard' because you've got to have the right mix of luck and muscle memory and you have to throw yourself at it again again. KSP can be hard because calculating the right setup for the right injection burn to put you in a viable position to get past Ike into a stable orbit around Duna with enough fuel to get you home is a staggering undertaking, a lot of planning and forethough.

This is one of those games that changes gaming. You will kick yourself, repeatedly, when you look back and realize you didn't have a chance to play KSP.

It is a complex, indepth, engaging, well balanced and changing but simplified to make it fun to play simulator for building and deploying rockets and ships to go into space, visit and explore other worlds and travel a solar system.

The developer is a big part of this success. One of the first trail blazers on 'early access' they have been amazing for involving the community. Several of the top modders for KSP (they love and support modding in KSP - not to fix bugs but add content) were engaged and used in building content for the 1.0 release even. They are still engaged in improving and adding content to KSP.

I've got close to 800 hours in at this point and still haven't really played swaths of the game, there are dozens of mods I want to try but haven't had the chance. This is the kind of game that's fun and engaging for years and years. Sometimes you need to step outside the regular run of the mill and see why a game like this has tens of thousands of reviews that are almost universally positive.
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264 of 301 people (88%) found this review helpful
19 people found this review funny
427.4 hrs on record
Posted: May 1
Mission Control: Launch in 10... 9... 8... 7...
Jeb: I'm already at the Mun guys...
Mission Control: WHAT? How?
Jeb: Well, the rocket blew up and blasted me 11,000 kilometers
Mission Control: Not again...

But seriously, buy this game. It's fantastic.
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296 of 342 people (87%) found this review helpful
24 people found this review funny
271.8 hrs on record
Posted: May 1
I got an asteroid and made it orbit the mun. Now the mun has a mun. 11/10
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204 of 229 people (89%) found this review helpful
26 people found this review funny
12.2 hrs on record
Posted: April 29
Got to the moon with 2 kerbals, half way back to kerbin I realized I left Bill on the Mun.

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266 of 315 people (84%) found this review helpful
7 people found this review funny
12.8 hrs on record
Posted: May 2
>Wanted to reach Mun
>Couldn't do it
>builded the most ♥♥♥♥ed up spaceship I could imagine out of frustration
>worked better than all my other attempts
>Crashed into Mun
> Happiest moment of my life

11/10 would put 28 rhino engines on rocket again
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100 of 103 people (97%) found this review helpful
1 person found this review funny
355.6 hrs on record
Posted: May 1
Truly Epic. One of those games I keep going back to (300+ hours as I write this).

Being a simulation, the number of situations you can find yourself in is nearly endless.

My most recent Kerbtastrophe occurred when my unmanned mapping and science probe (JoolStar1) was about to arrive at Jool after nearly 4 years in flight. Actually, it happened quite a while before that, I just wasn't aware of it.

I switched to the probe, ready to fine-tune my approach so I could cut through the atmosphere, bleeding off speed without wasting fuel.

Something was wrong. The probe didn't respond to inputs. That's when I realised I hadn't deployed the solar panels before leaving Kerbin orbit!

Cursing, I tried to deploy them. Nothing. I mashed the button repeatedly. Still nothing. I checked the batteries... Empty!

Since I didn't have a kerbal on board to do an EVA, there was nothing I could do except watch helplessly as JoolStar1 sailed straight past its destination, a failure destined to orbit the sun forever.

This game is all about failing repeatedly (and hilariously) until a Darwinian process of attrition results in an understanding of how to build, fly and land rockets.

I can't recommend it highly enough
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148 of 172 people (86%) found this review helpful
4 people found this review funny
92.7 hrs on record
Posted: May 1
Not as boring as a simulator, not too cartoony to loose immersion. Just perfect. 10/10
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77 of 82 people (94%) found this review helpful
6 people found this review funny
74.9 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.
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119 of 146 people (82%) found this review helpful
7 people found this review funny
19.4 hrs on record
Posted: April 30
I blew up Kerbin.

100/10 Best North Korean Space Agancy simulator ever.
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68 of 72 people (94%) found this review helpful
2 people found this review funny
68.3 hrs on record
Posted: May 9
While it's not exactly bginner-friendly, Kerbal Space Program (KSP) is a brilliant game for what it achieves. What other game can boast of accurate portrayal of orbital physics, staging rocket sequences and interplanetary travel? Gravity is a difficult beast to tame!

You're drawn in by the relatively simple ship construction aspect where you put together your ship like building blocks, attaching parts one at a time with options to make certain parts attach symmetrically. Once you're on the launchpad though, ♥♥♥♥ gets real. You will fail a lot, with your rocket exploding, or tipping over, or messing up the sequence of stages.

Just leaving the atmosphere and establishing an orbit is a massive challenge, and that is still the early game! Sending probes and landers to other planets and moons, building space stations and exploring the far reaches of the fictional solar system; these are all possible. Beyond that, the Career and Science modes provide new tasks and objectives such as completing contracts or carrying equipment to perform various scientific experiments, and further still the Sandbox mode allows you to set your own goals.

Unless you're a genius or have a huge deal of patience you will need to refer to various tutorials, wikis, guides and discussions online. If physics scares you off you will probably find it hard to enjoy the game beyond its initial simple tasks. You'll need to be willing to learn new things to get the most out of this game.

KSP will likely give you a new appreciation of the space program of the 20th Century and what was achieved with the technology available at the time. Any person who's dreamed of working at NASA must try Kerbal Space Program.

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82 of 93 people (88%) found this review helpful
1 person found this review funny
108.2 hrs on record
Posted: April 30
In my Steam library, there are about a half dozen games that are in a special category called "All Time Greats". Civ IV is there. Skyrim is in there.

KSP is in there.

Note my play time does NOT include the 50-100 hours I put in before the game was ever on Steam.

Simply one of the best products in the last decade, KSP is not your typical "game". It's a software toy. You tinker. You experiment. You adjust. You tweak. And you have a grand time doing it. KSP is not a game that is going to hold your hand and help you build a super-deluxe space rocket that can go to the Mun or Eve with ease. If it did that KSP would not be any fun. Besides, if someone wants that Buzz Aldrin's Space Race is available for sale on Steam.

Instead, you get better at the game. You develop an understanding of Newtonian Physics - more than you ever thought you would. You build massive rockets and undertake interesting expeditions. You'll grin the first time you get a rocket into orbit. You'll pump your fist when you land on the Mun for the first time. And you'll continue having fun.

What are you waiting for? Go buy it!
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84 of 97 people (87%) found this review helpful
2 people found this review funny
325.3 hrs on record
Posted: May 1
There are very few things that are so good that everyone should at least try them.

KSP is among the top of that list, regardless of your age.
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85 of 102 people (83%) found this review helpful
2 people found this review funny
164.8 hrs on record
Posted: May 2
Step 1. Build a rocket
Step 2. Launch rocket, only to realize that you didn't put fuel on your ship
Step 3. Get fuel, set to launch. The thruster you chose is too weak to move your rocket
Step 4. Get a ton of boosters
Step 5. Rocket leaves launch pad, booster overheats, blows up entire ship
Step 6. Re-evaulate entire game now that you have killed Jeb and realize that you will never have another Badass Kerbal
Step 7. Reset and repeat

Best rocket blowing up/personnel management game 2015 10/10
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82 of 99 people (83%) found this review helpful
6 people found this review funny
641.8 hrs on record
Posted: May 15
I've already played this game for a couple of hours and I think it's pretty nice.
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72 of 86 people (84%) found this review helpful
1 person found this review funny
582.3 hrs on record
Posted: April 30
Wonderful game. Long live games that encourage learning through actual fun!
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48 of 50 people (96%) found this review helpful
2 people found this review funny
73.6 hrs on record
Posted: May 22
It's been quite a ride. Four long years of development, cool stuff, accidentally education, and the Kraken... and here we are. One point oh (point whatever!) And oh, are things different! But that's all the past! Let's talk about the present.

This is a game in which you go to space repeatedly, success optional.

Most of the entertainment value in this game is either limited or boosted by your imagination. You can just throw some bits together, hit the go button and see what happens! What's that? There are Kerbals in there? I'm sorry, I couldn't hear you over the sound of my massive explosion device. Conversely, you can put things together in a very particular manner and create the perfect interplanetary shuttle. It's all up to you. Your sandbox is the solar system. Go play. Due to the nature of things and such, this game would be truly incredible in a classroom environment, yet it's just as fun alone at home.

Now, for the less sandbox-oriented among us (or just the people like me who enjoy progression,) there's a career mode! This time, you start out with the exclusive ability to make short range, manned, ballistic missiles! FOR SCIENCE! Seriously, you generate Science! from everything, and you use it to unlock more things to build better missiles to make more Science! Be careful though. Don't want to blow up too many bits, because you have funding to worry about now. You should also take care of your Kerbals to keep your reputation acceptable.

Also the camera shakes, there's complicated aerodynamics, there's thermodynamics, there's moresodynamics, there's orbital mechanics, there's resource mining (which you can MAKE FUEL with,) there's management, there's pretty explosions, there's good sound effects that are also deafening, there's accidentally education, and so much more for only some money!

However, the tutorial is absolutely useless and frustrating. Ignore it, fumble around for a while, and utilize the internet to learn what you must know when you decide that trial and error is so last era.

There's not really much else to talk about... All the other details are either not noteworthy, neutral, or better kept quiet... so...

Go build some intercon- advanced spacecraft.
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46 of 47 people (98%) found this review helpful
7 people found this review funny
2,183.9 hrs on record
Posted: May 4
Kerbal Space Program version 1.0.2. I've been playing the early access game for over 2 years, but now that it became official I thought I'd write a review. My review is very positive. (But see the caveat about version 1.0 below at the bottom).

(Full disclosure: I don't work for SQUAD but I do help write one of the mods for the game, so I am personally invested in this.)

Get This Game. For once a sci-fi game that is actual sci-fi and not science fantasy. It doesn't insult the intelligence of the player, and it speculates what-if, in a relatively reasonable way, only breaking a few laws of physics here and there where needed for gameplay, rather than breaking ALL of them constantly like most space video games do.

Kerbal Space Program as history:
Although the solar system in the game is artificially smaller than would realistically be possible (so it doesn't take as long to get things done as it really would), it still has all the parts and the right places to emulate historical real-world space programs. Don't be fooled by the cute derpy-looking Kerbals - you can use the game to see what it would be like to emulate historical actual space missions - space stations in low orbit, docking maneuvers, performing an Apollo-style "Mun" landing, send rover probes to "Duna" (which is Mars-like), and so on. All from gluing together parts and having fun.

(And if you really want to go all-out, there are user community mods out there that replace the game's solar system with the real thing, so you can really try these missions out in full size).

Kerbal Space Program as a 'tycoon' style game:

If you like the old style 'tycoon' games where you have to come up with a means of keeping your business afloat and research new technologies to do interesting things as you move on to bigger and more ambitious projects, then Kerbal Space Program Career Mode is for you. Start up a new game, pick "career mode", set Normal or Easy difficulty (do NOT use Hard until you've played a while), and you'll have the fun of trying to balance funding (for making better space center buildings, and for making the rockets themselves), reputation (for making future offers you see be better for you), and science points (for buying your way up the tech tree). Accept contracts, and try to fufill them cheaply so your space agency makes money from them to fund the other stuff you want to do. Don't fail them or else you'll lose funds and rep for it.

Kerbal Space Program as a mod platform:

From it's early access days, a user community of modders has grown, such that you can do just about anything you can think of with the game. As of this writing, because KSP 1.0.2 is relatively new, some of those mods won't work just yet, but they will after only a week or two. If past use is anything to go by that's about how long it takes for the modders to catch up to a new release. As Steam is not the only means of obtaining the game, and not even the first means of obtaining it, the company, SQUAD, has chosen not to support Steam Workshop for mods due to the way it would open up the chance for people to make Steam-only mods that would be unfair to those who bought the game in its early days and supported the company before the game was even on Steam. I support this decision, but it does mean you'll have to take a few extra steps to find the mods and install them. Look up "KSP" on and look for most mods are in both places.

Kerbal Space Program as "edutainment":

The game is quite educational, but in that good sneaky fun way, where you don't realize you're learning - you're just trying to get stuff done in the game and in so doing learning stuff along the way. If you've got a teenager or pre-teen at home, give this to them. It does something that is really hard to do - it *demonstrates* though gameplay how a mathematical concept works, visually, without revealing the actual formulas, in such a way that the hard math can come *after* the intuitive understanding. Usually what makes math hard is that the understanding and 'feel' can't happen until *after* you understand the numbers. But here, it lets you play with the phenomenon first, and understand it later after its behavior has becomine intuitive to you, rather than the other way around.

Get. This. Game.

A caveat:

My review refers to the 1.0.2 version of KSP and emphatically NOT to the 1.0 initial release that came out a week before and had a critical re-entry bug. Had I written the review about the 1.0 version, it would not have been as kind. The 1.0 release was rushed by about a week. The 1.0.2 release from a week later was MUCH better, and is probably what should have been the 1.0 release.

R.E. The KSP 1.0 re-entry bug: You may read reviews by people complaining about re-entry being broken when 1.0 game out. Those reviews weren't wrong *at the time* they were written. KSP 1.0 was rushed out with a re-entry bug that was very unfair, and importantly, really obvious so it's hard to imagine how they missed it. Adding a heat shield actually *caused* the ship to blow up on re-entry because adding it made the vessel flip nose-first, rendering the heat shield worse than useless as a part. If you see reviews complaining about this behavior, be aware that they are stale and referring to an old version.

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201 of 289 people (70%) found this review helpful
1 person found this review funny
7.7 hrs on record
Posted: May 2
An accurate depiction of ISIS's space program.
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54 of 63 people (86%) found this review helpful
1 person found this review funny
96.9 hrs on record
Posted: May 7
You will never forget your first Mun landing.
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45 of 50 people (90%) found this review helpful
2 people found this review funny
182.7 hrs on record
Posted: May 15
Orbital mechanics sounds like a boring subject until you throw a few green guys into a rocket ship that you have to pilot around a fictional solar system.

This belongs on your computer and in every science classroom across the globe.
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