Kerbal Space Program is a multi-genre game where players create their own space program.
User reviews: Overwhelmingly Positive (13,497 reviews)
Release Date: Mar 20, 2013

Sign in to add this game to your wishlist or mark as not interested

Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game may or may not change significantly over the course of development. If you are not excited to play this game in its current state, then you may want to wait until the game progresses further in development. Learn more

What the developers have to say:

“KSP is still under development. This means the game will be improved on a regular basis, through updates that add new features, content and bug fixes, so make sure to check back for new versions.

The game is being built as a sandbox first, so there are no objectives yet, but we want you to try it out and have fun with it already. You're free to build anything you can think of, and there is an entire Solar System to explore.

During development, KSP is available for purchase at a discounted price, which will gradually increase up to its final retail price as the game nears completion. So by ordering now, you get the game in its current state, and you'll get all future updates for free.”
Read more

Buy Kerbal Space Program


Recommended By Curators

"Do you like making things go fast? Is "this obviously needs more rockets" something you say on a daily basis? Then get KSP and launch some Kerbals!"

Recent updates View all (14)

October 7

Kerbal Space Program: Economic Boom is Now Available for Download!

Kerbal Space Program, the award-winning, indie space agency sim game from Squad, released its latest update, Economic Boom, and it is available to play today.Updates are free to existing players. KSP: Economic Boom offer new players the most fully-realized version of the game, which is still in active development for PC, Mac and Linux as an Early Access title on Steam and via the game’s website.

Players will experience a new challenge as the Kerbal Space Center, where players build and launch their rocketships, is now fully destructible. Buildings can be decimated by poorly-steered rocketships and in the game’s Career Mode, require costly repairs for players trying to manage their space agency.

Among these buildings is the new Administration Facility, in which players can select and activate Strategies. The Strategy system is a new gameplay mechanic, where each strategy, once accepted, applies effects over several game aspects, specifically Kerbal Space Program’s three in-game currencies, Funds, Reputation and Science. Some examples include:

  • Aggressive Negotiations: Enables players to get a discount on the cost of parts but at a cost to Reputation on each ‘discount’
  • Open-Sourced Technologies: Divert Science earnings to make them public domain, increasing Reputation.
  • Unpaid Intership Program: Boost your Science earnings without spending any Funds by hiring unpaid interns to do the data crunching. Working for the Space Program surely is its own reward, isn’t it? Well, as long as an agency’s Reputation lasts that is.

Career Mode is getting a significant addition with the Administration Building and all that comes with it,” Felipe Falanghe, Kerbal Space Program creator and lead developer said. “The Strategy system gives players great freedom to change the rules around, and ultimately it allows them to tune the game to fit their own ways of playing. Also, as it’s fully moddable and new strategies can easily be added, this new feature has a lot of potential for expansion.

The team also worked with modder, Christopher “PorkJet” Thuersam, to incorporate his popular SpacePlane+ parts pack mod to the game. This was more than a simple addition however: Each part was updated for even better looks, and to offer players parts that are there not just specifically for spaceplanes, but that can be used in as many combinations as possible.

The game is now available for 40% off on STEAM and the KSP STORE.

131 comments Read more

July 25

0.24.2 Hotfix Patch Released

Hi again,

I'm sure most of you have noticed a mildly infuriating bug related to right-clicking parts after yesterday's patch... So did we. It was fortunately a simple fix, and we've got a hotfix patch available now.

Here's the changelog:

============================ First Contract (v0.24.2)


* Fixed a critical issue which prevented opening the right-click menus for several parts.

As always, the latest version is available on the download page at the KSPStore, or an automatic update will be headed your way if you're on Steam.

Happy Launchings,


53 comments Read more
See all discussions

Report bugs and leave feedback for this game on the discussion boards

About This Game

Kerbal Space Program is a multi-genre game where players create their own space program.

In KSP, you must build space-worthy craft, capable of flying your 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 is being built first as an open sandbox, you're free to build anything you can think of, and fly it wherever you want, even into orbit and out to other planets and moons throughout the Kerbal Solar System. The first draft of the career mode is also available now, it is still in development, so expect more features!

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.

Planned Features

  • Take on Missions to attract interest in your Space Program.
  • Discover new worlds and expand the scientific knowledge of Kerbalkind.
  • And a whole lot more!

System Requirements

    • OS:Windows Vista
    • Processor:Core 2 Duo
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Windows 7
    • Processor:Core i3
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
    • OS:Snow Leopard
    • Processor:Dual Core Intel
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Mountain Lion
    • Processor:Core i3
    • 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 i3
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
Helpful customer reviews
338 of 349 people (97%) found this review helpful
398.4 hrs on record
Early Access Review
I was able to learn and actually understand far more about orbital mechanics by playing this game obsessively for 2 weeks than doing an astrophysics course for a year at university.

This was originally a neat little rocket building and exploding simulator that attracted a couple of hours' worth amusement before being returned to the "may play again later" shelf. After many updates, it has grown into an immensely satisfying personal sandbox space programme simulator.

The first time I landed a Kerbal safely on the Mun was a historic moment, and very emotional... until moments later when I wondered how Jebediah would possibly get back. Swiftly, a rescue mission was devised. Hours were spent meticulously over-engineering an overly capable craft, until I realised I felt quite hungry. I couldn't decide what to eat, when I noticed the name of the planet Mars equivalent. Seeing it as almost divine inspiration, I went out and got a Duna kebab. Very satisfied with the food the game chose for me, I spent the next few hours trying to fly the monstrosity that could only barely be called a "return vehicle" without: 1) exploding on launch. 2) tipping over and exploding whilst landing. After many reverts and quickloads, it was finally successful. A celebratory viewing of Apollo 13 ensued, followed with feverish design work on the next, more ambitious project. And then it was 6am.

The game is far too addictive.

I now wish I had studied aero engineering instead.

There is a full solar system to obtain science on explore, with lots of ways to do it. Contraptions which can only be described as "adorably ridiculous" yet surprisingly effective may be constructed to your heart's content. As with many other sandbox games, you provide your own amusement - set yourself ridiculous tasks and restrictions, be efficient or over-engineer the ♥♥♥♥ out of everything such that the Littoral Combat Ship looks like a very sound and practical design.

With or without mods (of which there are many), you can build almost anything from planes and land vehicles to giant flying space horses and bananas.

Official multiplayer support in the future was announced a while ago, and there is currently a multiplayer mod that allows you to build space stations or conduct joint missions with friends and partner agencies.

It is still currently in development, with more and more features being added with each major update. Even in its current state, I would be more than happy to pay double its current full price based on how much enjoyment I have gotten out of it.

TL;DR: Spectacular failures, decided what I should have to eat one day and now I regret my key life decisions. Would buy again.
Posted: September 24
Was this review helpful? Yes No
1,136 of 1,371 people (83%) found this review helpful
5.5 hrs on record
Early Access Review
Just like Human Centipede, this game is medically and scientifically accurate.
Just like Apollo 13, you will have a lot of problems.
Just like Shakespeare, it will end in tragedy.
Just like NASA, you will not have enough funds to continue missions.
Just like your grandma, you will end up as ashes.
Just like Boy Meets World... except face first.
Just like Die Hard: With a Vengeance... except no vengeance.
Just like a Japanese Kamikaze pilot... except unintentional.
Just like your girlfriend's virginity... all will be lost.
Just like gay marriage... you will eventually get close.
Just like an adopted baby, you will long for reuniting with mother moon.
Just like a failed marriage, you wonder where it all went wrong.
Just like an Islam extremist, you will scream prior to your death.
Just like a cookie, you will crumble.
Just like Selena Gomez, you will have one good hit, but can't replicate it no matter how hard you try.
Just like a crazed sociopath Jebediah will ALWAYS smile, whether he's being thrown into the sun or on a fire-reentry back into Kerbin Orbit. - (Cobalt Lightning)
Just like you have Alzheimers, you will forget your parachute - (Austin)
Just like war, It never changes. - (Dr. Strangelove)
Just like Peppi you'll use the boost to get through. - (Kodiak)
Just like Falco there will be something wrong with the G-diffuser
Just like Slippy, "Help me!"
Just like a large burrito. It looks delicious, but always ends up a terrible mess.
Just like a Stormtrooper you'll never hit your target
Unlike Luke Trusting your instincts will get you killed
Unlike Star Wars, the only force you need to be concerned about is Mass X Acceleration
Just like a necromancer, you'll have absolutely no life - (Kodiak)
Just Like North Korea, The Rocket will never launch - (Sir Panda)
Just like a Space Marine, we call it Steel Rain - (Kill-Cam Celebrity)
Just like Skyrim, your steed will only be able to fly for minutes at a time - (Kill-Cam Celebrity)
Just like SimCity, you'll quickly learn your building skills are ♥♥♥♥ - (Kill-Cam Celebrity)
Just like HL2.exe, everything will stop working. - (Kill-Cam Celebrity)
Unlike a console port, none of your frames are properly locked. - (Kill-Cam Celebrity)
Just like a Scout, Jebediah runs fast and dies a virgin - (Kill-Cam Celebrity)
Just like your mom's house, one mistake and you're out - (Kill-Cam Celebrity)
Just like Early Access, you'll have a good concept but it won't be going anywhere. - (Kill-Cam Celebrity)
Just like the review writer, you'll take other ideas as a "community effort". - (Kill-Cam Celebrity)
Just like Russia. You can only love it or hate it. - (Selina Kyle)
Just like EA, you promote it as a good thing, but it turns out to be a bad thing - (NOSCOPE)
just like a Steam sale, you will use the funds that you don't have. - (Broccoli)
Just Like Adventure Time, Grab your friends & go to very distant lands. - (Kanjzo)
Just like IPhone 6, It will bend. - (Kanjzo)
Just like this review, f*cking ♥♥♥♥♥♥♥♥, dude - (Chris Atkins)
Just like a bomb ... BOOOOM!!! - (Chasew) [clever haha]
Just like Star Trek movies, every other launch will suck. - (#SwagnarTheSweg)
Just like a heart transplant, it was all going so well... - (Nigel Burke's Wristwatch)
Just like the definition of insanity you will do things over and over expecting things to change and they never do. - (Swumprat)
Just like Counter-Strike, you think its easy to aim and land but you discover that you suck at it. - (Goonfighter)
Just like Dwarf Fortress, losing is fun! - (Amok God of Blood)
Just like chipotle, you'll have a good feeling at first but then your spaceship will explode like your digestive tract. - (Chris. P Back edit by Less than 3)
Just like LSD you think your doing good but you just look like a ♥♥♥♥♥♥ screaming at a screen - (Rustic_Chaos)
Just like Commander Shepard, this is my favourite review on the Citadel - (Cryken) ;D
Just like League of Legends, you will rage but keep playing for some reason - (AsnBoi69)
Just like a skiing holiday : You'll go all the way up just to tumble down screaming WEEEEE! - (EngineerFalcon)
Just like Dark Souls, you'll keep coming back, no matter what happens. - ([ALPB])
Just like America: No matter how many missiles you launch the only thing you accomplish is debt. - (Onahara-Senpai)
Just like the Illuminati, there's hidden pyramids. - (Bill_Rye_The_Bread_Guy)
Just like a model rocket, only one out of 10 you recover. - (Xelloss)
Just like Obama, you say you will accomplish a lot, but you never do. - (MessyBionicJew)
Just like chocolate, it's satisfying at first, but destroys you in the long haul. - (Jamiedodgey)
Just like the fez devolper it all ends with a rage. - (Game of Pwns)
Just like duct tape on a rock, nothing you attach to it will help it fly any farther - (SaintMcDougall)
Just like fireworks, do i even need to explain? - (Your Cat)
Just like a James Bond/Michael Bay movie, everything will explode - (Your Cat)
Just like a cat, looks cute but will ruin everything :3 - (Gorloss)
Just like Gaben, it will be worth the weight - (01000110011001010110000...)
Just like every Call of Duty, you will make carbon copies of another ship with only minor changes. - (Satan)
Just like a psychopath, there will always be one person that laughs when everyone is killed - (Satan)
Just like religion you can stick as much stuff on it as you want but it will never work - (Neardy_nugget)
Just like the Japanese, you'll watch it explode twice before fixing the problem. - (XA)
Just like...
Posted: May 14
Was this review helpful? Yes No
116 of 131 people (89%) found this review helpful
569.3 hrs on record
Early Access Review
Learning practical applications and basic principles of newtonian physics, principles of propulsion, aerodynamics, math and all that other fun stuff. Side benefits.

The real big part of this game is the explosions.
Posted: April 28
Was this review helpful? Yes No
77 of 84 people (92%) found this review helpful
218.0 hrs on record
Early Access Review
Some say the main character isn't afraid of anything, except small insects. And that he once made it to the Mun with his eyes closed. All we know is: he's not the stig, but he is Jebediah Kerman!

This game has exerything you want in a "space race" game. You have explosions, the ability to build the best spacecraft you can comprehend; and best of all, you have raw power.

You may first get it and think, "what was I thinking when I got this, it's more difficult than becoming friends with Piers Morgan!" With that, you would be correct, but what you need... is to practice with many many crafts to get the right ideas.

The controls are like some kind of madness that would drive you away, but it's very easy to understand after you play for a bit.

All in all, I must say: this is one of the best games... in the world, and even out of it. If you wanted to pick this up for a mere 27 dollars (17 Quid), you would have to be mentaly insane to not get it.

And on that bombshell, back to the studio.
Posted: September 29
Was this review helpful? Yes No
207 of 292 people (71%) found this review helpful
24.0 hrs on record
Early Access Review
I finally found the hidden Restaurant at the Mun- Sadly there was no Atmosphere at all.
Posted: July 8
Was this review helpful? Yes No
3,949 of 4,066 people (97%) found this review helpful
101.5 hrs on record
Early Access Review
One day my daughter came home from school and asked me "Have people actually travelled to the Moon? How is it possible?"

Two years ago, I would have answered "yes, but I don't really know how. It's very complicated, with lots of math and science. You might learn about it in a physics class in 10 years time."

Instead, I answered "Here, let me show you." and fired up Kerbal Space Program. We built a moon rocket and launched it, me steering and she hitting the separation detonation buttons when needed. 30 minutes later we had landed on the moon.

Thank you, Squad, for enabling me to give that answer.
Posted: March 19
Was this review helpful? Yes No