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 (625 reviews) - 93% of the 625 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,727 reviews) - 97% of the 31,727 user reviews for this game are positive.
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


Recent updates View all (35)

October 11

Kerbal Space Program update 1.2 “Loud and Clear” is now available!

Hello everyone!

Kerbals hit a milestone, they are now interconnected and they can hear you Loud and Clear! Let your imagination fly with new possibilities, build communication networks, control vehicles remotely and explore every inch of the Kerbol System in ways that weren’t possible before with this new update!

Kerbal Space program 1.2: Loud and Clear includes a broad range of improvements and features that will enrich the overall game experience, such as the introduction of CommNet and KerbNet, a rewrite of the Stability Assist System (SAS) that makes your launches more accurate and fuel efficient, an engine change from Unity 5.2 to 5.4, more tweakable options for many parts, a complete fuel system redesign, and much more!

Here are some of the highlights for this update:

Set up your own communications networks and have better control over your probes even when they cannot establish a direct connection. Link your probes back to Kerbin via an antenna to be completely autonomous and build relay networks for better science transmission!

Use satellites for reconnaissance purposes, scan the terrain below you, find biomes and anomalies, and place custom waypoints with a targeting interface.

Improved Fuelflow System
The Fuelflow system has been rewritten and now you have total control over how the fuel flows through your vessels!

Improved Wheels
The stability of Wheels has been greatly improved. Your rovers, wheeled vehicles will now turn and handle smoothly, making the overall driving experience more pleasant. Aircraft are also more stable, and all wheels have realistic load limits.

You can find the complete changelog here.

Kerbal Space Program 1.2 Loud and Clear is now available on the KSP Store and on Steam, and will soon be available on other third party platforms.

228 comments Read more

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!

366 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
Customer Review system updated Sept. 2016! Learn more
Very Positive (625 reviews)
Overwhelmingly Positive (31,727 reviews)
Review Type

Purchase Type


Display As:

(what is this?)
25,252 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
239 of 279 people (86%) found this review helpful
244 people found this review funny
1,436.8 hrs on record
Posted: September 28
Just remember to eat and drink occasionally.
Was this review helpful? Yes No Funny
11 of 11 people (100%) found this review helpful
1 person found this review funny
249.5 hrs on record
Posted: October 20
This is my most played game.

It has brought me the most pain.

The most anger.

At times I feel like I'm playing dark souls, in space, with adorable little green men.

This game has done so much for the future of astrophysics, these guys deserve global recognition for the excitement they have generated in new generations for space travel and exploration.
Was this review helpful? Yes No Funny
7 of 7 people (100%) found this review helpful
395.7 hrs on record
Posted: October 3
This is probably, my favorite game ever.
Its the only game that after a while I miss the ambiance, the music, the sounds and simply have to get back to.

I suck at it, its very hard to master (if its ever possible) but its simply great.

I could not recommend it more
Was this review helpful? Yes No Funny
5 of 5 people (100%) found this review helpful
5 people found this review funny
515.9 hrs on record
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."
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
404.3 hrs on record
Posted: October 6
Perhaps the greatest space exploration game there is

Author's note: Upon reaching 100 hours in this game, I decided to write a lengthy review. Recently, however, I reached another milestone in the form of 400 hours. As such, I felt that the time was ripe to write a new, better review.

I was born on the exact same day as the Mars Polar Lander was to touch down on the south pole of Mars. This NASA probe was going to broaden our knowledge of the red planet - not unlike countless other probes that had already visited - but this was, regrettably, not to be. Prior to landing, an error caused the craft to crash into the Martian surface at a high speed.

Errors like this are common in Kerbal Space Program as well. We all know how it is: You've sent a lander-type probe or capsule through the Kerbol system, and at last, the target is right below you - be it the Mun, Duna, or any other solid object. At some point, you discover that there's not enough juice. Or not enough electricity to keep the baby under control. Or that there is enough fuel - but only for a landing. Which is fine if it's an unmanned probe, but good luck if you have three unlucky Kerbals on board. It's a good thing they cannot die of thirst, hunger, exhaustion or boredom.

The interesting thing about KSP, however, is that these errors do not matter. You might have an impressive explosion on the launch pad, a complete failure while trying to leave the atmosphere, or a more annoying error - like the fact that your fancy satellite doesn't have enough batteries, or that you forgot to bring science instruments. But guess what? This game encourages you to try again. If you fail in this game, it will not shove you into a ditch and laugh. Rather, it will help you back up and tell you what went wrong. In Kerbal Space Program, it is quite simple to spot errors by experiencing them. And then, it is equally simple to fix that error with a small upgrade - say, an improved booster, or some extra batteries. Eventually, new problems will appear - and you fix those too. And through this trial and error, you get the perfect rocket at last.

This is where the game suddenly becomes truly magnificent. For quite a lot of time, I didn't have any idea how to get my crafts into orbit. So I created a proper rocket, tried to figure out what went wrong the last times, modified the rocket accordingly, and then gave it a shot. Minutes later, a satellite is safely in orbit around Kerbin, telling me interesting things about the atmosphere and cheerily transmitting signals down to the surface.

Obviously, I got a massive confidence boost because of this. You can probably guess what happened next: I put together a Saturn V-ish rocket and tried to send some (un)lucky Kerbals to the Mun. It didn't go as planned, to say the least: They all ended up burned or exploded, mostly the latter. So guess what I did? I went back to the drawing board, created a better rocket, took it through extensive testing, and then the day came. It was my own July 1969. Jebediah and Bill were now Neil and Buzz. And guess what? The Kerbin flag was planted firmly on the Mun, and my brave little Kerbonauts returned as heroes, becoming the public favorite for a future mission to Duna. But that's another story.

Moving on from stories of trial, error, success and joy, it's time to look at what the game has to offer. As you've probably guessed by now, it's about building rockets and sending them into space. The wide range of parts, physics, planets and celestial objects allows you to create your own little NASA. Probes, space stations, capsules, landers, rovers and airplanes are all possible to design and cr- fly as you please.

Why the "Kerbal" in the name? Well, this game takes place in a fictional planetary system with smaller planets, moons and distances. The Sun is named Kerbol, and orbiting it is Moho (basically Mercury), Eve (basically Venus), Kerbin (basically Earth, with humans being replaced by green-skinned, adorable Kerbals), Duna (basically Mars)...Yeah, you get the idea. The game has lots of planets and moons to visit, most of which are fully explorable.

The game modes? You got three different modes, suited for different playstyles. Sandbox is simple: No progress, credits or reputation (we'll get back to that), but every rocket part and all upgrades available at no cost. If you enjoy building whatever you want with no consequences, Sandbox is fitting. Next out is Science. It works similarly to Sandbox, but with another interesting factor: You have to research and unlock new rocket parts by doing science. "Science" can be anything from taking a ground sample outside of your local space centre, or landing a rover on a distant planet to do geological surveys. The more interesting, the more science.

The final mode is Career. In this mode, it's money-earning time. You start off as a small space agency with sheds instead of hangars and no capability to reach space whatsoever. So what do you do? There are three things that you need to focus on. First of all, science - we've already gone through that. Second, money. This is self-explanatory; earn money, buy rocket parts, build bigger and more expensive rockets, and upgrade your facilities - but how to earn money? This is where Reputation comes in.

To put it simple: You earn Reputation by doing cool stuff and not messing it up - take a tourist into space, land a probe somewhere, et cetera. If you do mess up, you lose Reputation. Here's the fun part: Higher reputation means better Contracts. There are plenty of corporations that are willing to give you some money if you can satisfy their demands. Complete a contract, and get more Reputation, Science and money. Fail a contract? Yes, you guessed correctly.

Now let's move back to space exploration. Let's say that you've done all your preparations, signed the necessary contracts, and launched some nice stuff into space. You got some satellites here and there, and even some Kerbals screaming for help at the Munar surface (let's pretend you have a rescue ship underway). Now what?

Well, there's mods. This is one of the many areas where Kerbal Space Program really shines - mods. The game has an active, engaged modding community, and you can find a mod for just about everything. There's a mod that allows you to place a wall near your space center and have those pesky Kerxicans pay for it. Seriously, there is. But i'm not here to talk about that.

Mods available include, but are not limited to: part sets with massive fuel tanks, engines and more; intricate, advanced space capsules for all your exploration needs; plugins that allow you to time your maneuvers, get better at docking or put things on autopilot; visual mods that give you enhanced skyboxes and magnificent atmospheres; whole new planets altogether that expand your frontiers greatly. And more. I could probably talk for hours about the various mods that are available, but I won't. I'll just say that most of them are amazing. If you're buying this game, make sure to grab a few mods. If you already have it, but don't use mods: Why?! If you have mods: Get some more mods. Mod it till it breaks, as some people would say.

There are plenty of things that I have omitted from this review - mostly because I want to end things here. I could probably talk about the magnificence of docking, the beauty of well-placed orbital maneuvers or other things that could make a NASA engineer smile gleefully. For now, though, i'll advise you to place yourself firmly into the capsule and go into space.

To summarize: Kerbal Space Program is an excellent space game that provides great experiences, combined with interesting gameplay and great mods, all while being a highly successfultake on sandbox, exploration and simulation alike. I can absolutely recommend it.
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
2 people found this review funny
759.1 hrs on record
Posted: October 13
I can colonize the moon of a gas giant but I can't dock two ships orbiting kerbin together.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
725.5 hrs on record
Posted: October 7
Kerbal Space Program is truly something unique.

How do you market a game about rocket science -- the default analogy for "something extremely complicated" -- to an audience big enough to justify your budget? Well...there's a lot of little things that make it playable to many people.

First of all, it's a make-your-own-experience sandbox. Just like Minecraft (before there was an End), there's no final goal, no objective arrow. It's just you, an bunch of spaceship parts, a few kerbals, a custom solar system, the infinite expanse of space, and explosions. Lots and lots of explosions.

Second of all, this game about rocket science isn't about ALL of rocket science. There's quite a lot of liberty taken with the laws of physics, all in the name of simplicity. You don't have to worry about fuel flow, or life support, or the speed-of-light delay. All of that is benched in favor of less subtle things, like orbital mechanics, atmospheric shock-heating, and (look this up; it's practically KSP 101) delta-V and Tsiolkovsky rocket equation.

But here's the best part; all of these ignored facets of space travel can be added into the game. KSP has a very robust and active modding community, and I'm sure enough mods exist to make the game as realistic as you could possibly demand. Life support? There's a mod for that. Several, actually, in varying degrees of difficulty. Fuel flow? Part of Realism Overhaul. Speed-of-light delay? Check out RemoteTech. There are even mods that replace the stock solar system with our very own, real system, and even mods that add entirely new, dreamed-up systems. (I highly recommend starting out with no mods, then adding them as you become comfortable with what you already have.)

Really, Kerbal Space Program is great for the same reason Minecraft is great. It expects nothing in particular of you, it just wants you to do whatever comes to mind. If that means strapping a hundred boosters together as randomly as possible and watching the fireworks, that's fine. If that means methodically landing on every planet and moon one-by-one, that's fine. If that means brutally murdering your kerbals, well, heck, they're just as surprised to be alive as you are, so go for it.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
110.6 hrs on record
Posted: October 19
This is a really good game if you like space and stuff. SCIENCE
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
1 person found this review funny
1,435.4 hrs on record
Posted: October 13
It turned me into an 8-year old boy who just saw his first rocket launch. I had a birthday cake with rockets on it. It's easily the best game I've ever played, and it just gets better with every new version.
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
2,868.2 hrs on record
Posted: October 11
Kerbal Space Program.

Those three words put a smile on my face every single time I hear them. Endless hours of enjoyment bringing a sense of achievement that no other game can bring. I've done so much, LEARNED so much.
  • If you're a player who enjoys challenge, KSP is for you.
  • If you're a player who enjoys space exploration, KSP is for you.
  • If you're a player who enjoys experimentation, KSP is for you
  • If you're a player who enjoys actually learning something while playing, KSP is for you.
  • If you're a player who enjoys a vibrant online community, KSP is for you.
  • If you're a player who enjoys mod support, KSP is for you.
  • If you're a player who enjoys games, KSP is for you.
Buy it, plain and simple. There's nothing else like it in all the world.
Was this review helpful? Yes No Funny
Recently Posted
53.0 hrs
Posted: October 26
first shot at mun orbit. didnt have a good approach so old jeb got slung all the way to duna from an accidental slingshot manuver.
10/10 would learn that gravity is a b**ch
Helpful? Yes No Funny
86.6 hrs
Posted: October 26
Don't recommend if you have a Mac. Crashes on start, tried lots of supposed fixes. None works for me. So doesn't work at all on Mac as far as I can tell.

Great Game on PC.
Helpful? Yes No Funny
54.2 hrs
Posted: October 26
I have never played a game that was as addicting as this one. There is never a dull moment in KSP!! There is always something new that you can do!! Or something you can continue to add on, or explore. It really gets fun when you play with mods!
Helpful? Yes No Funny
423.0 hrs
Posted: October 26
There seems to always be something to do even when you think you have done everything. The game has an amazing modding community releasing awesome mods to keep the game fresh and filled with diffrent play styles. You get to choose how difficult you want the game to be.
Helpful? Yes No Funny
hadeeh . . .
155.1 hrs
Posted: October 26




Helpful? Yes No Funny
456.1 hrs
Posted: October 26
If you are the type of person that sees NASATV in your smart tv... this game is for you.
Helpful? Yes No Funny
128.9 hrs
Posted: October 25
The subtle power over gravity.
Helpful? Yes No Funny
234.6 hrs
Posted: October 25
I canot recomend this game enough, it is one of the best physics games, one of the best educational games, best space game, best sandbox game, and on and on. Sereusly if you have even a pasing interest in video games as educational matereal, space, or video games in genral you owe it to yourself to play kirbal space program.
Helpful? Yes No Funny
Obi Spudgunobi
82.5 hrs
Posted: October 25
I've been playing video games for 35 years, this is most probably the most entertainment I have ever had from a game!
Bought in a Steam sale so most likely the best value for money from a game too.
Love it!!!

Please note - you must have a reasonable understanding of physics to figure this out, it is not suitable for "most" kids under 10.

More of this please!!! More contracts etc etc etc,

Wonderful game, fully recomended if you like this sort of thing!
Helpful? Yes No Funny
98.8 hrs
Posted: October 25
Amazing and a worthwhile game / simulator. Very enjoyable. Giant time eater.
Helpful? Yes No Funny