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 (579 reviews) - 94% of the 579 user reviews in the last 30 days are positive.
Overwhelmingly Positive (30,541 reviews) - 97% of the 30,541 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.

162 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.

169 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:Lion (10.7)
    • 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 (579 reviews)
Overwhelmingly Positive (30,541 reviews)
Recently Posted
( 1.0 hrs on record )
Posted: June 30
Don't let my play time fool you, i have been playing kerbal since the day it was released, only just decided to buy it on steam. KSP is like no other simulator out there, the attention to detail, the physics, the mods, the humor, this game has it all. If you're a fan of space, exploration, building and a genuine sense of accomplishment than you should give KSP a try, i won't lie, there is a steep learning curve but a few hours in and you should be able to figure most of it out. That being said, it's not for everyone as it's the type of game where you have to use your brain to succeed, so if you're an idiot, i would suggest you keep to MOBAS.
Helpful? Yes No Funny
( 528.4 hrs on record )
Posted: June 30
With gametime over 500 hours I thougt I should write a review. I've had this game since it was an early access game, and I still enjoy it a lot. Some mods should be essential such as "Renaissance Compilation", it makes the world a lot more realistic and enjoyable. It is difficult for everybody the first time, but with some practise you'll gain experience beyond your imagination. I was so proud the first time I landed on the mun that I snapchatted my friends even if it rolled over to the side. Now I am a quite experienced player and I think almost everything feels too easy. So don't refund the game just because it is hard.
Helpful? Yes No Funny
( 28.1 hrs on record )
Posted: June 30
i love this game and i want to say yes to recomending it but i can. so i used to play this game a lot and love it, then i got a better pc after not play for a while then i decided to play again *build a rocket* * go to launch pad* *fail* *revert to vehicle assembly* *CRASH* get on game *fix vehicle a bit* *lauch* *CRASH* thats why i can recommend this game
Helpful? Yes No Funny
( 373.5 hrs on record )
Posted: June 30
-learn how to build a rocket.
-build a rocket.
-launch it.
-crash it.
-build another rocket.
-send it to the mun.
-land it on the mun.
-realize you have a lot of fuel left.
-send your rocket to duna.
-land your rocket on duna.
-realize you have no fuel left.
-let your kerbals die.

10/10 best genocide simulator out there
Helpful? Yes No Funny
( 995.3 hrs on record )
Posted: June 30
This game is god's gift to gamers. If you've seriously never tried it then you owe it to yourself and your intellect to get it. Master it. Get to the moon, hell get to Mars (or Duna as it's called in game). Master this game and you will know everything you need to know about rocket science. It's really really awesome.
Helpful? Yes No Funny
[RES] Rph
( 36.5 hrs on record )
Posted: June 30
Fun game that involves logic thinking and predicting. Very recomended for people who like to explore.
Helpful? Yes No Funny
de bezt persuhn evr
( 28.2 hrs on record )
Posted: June 30
Whilst attempting to send a small communications satellite into orbit, I found a miscalculation in my estimate. I accidently went to Minimus. In that one small trip, I went into orbit of:

Kerbin (Obviously)




10/10 would miscalculate again.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
597 of 620 people (96%) found this review helpful
604 people found this review funny
212.7 hrs on record
Posted: May 31
>Buy game in sale in 2013
>Spend 4 months attempting to get to the Mun
>Spend the entire space program's budget on a Mun mission
>Forgot solar panels
>Jeb crashed due to lack of power. He is now stranded
>Tell him I'm mounting a rescue mission
>Get sidetracked flying planes to get more funds
>Accidentally learn to dock
>Somehow get to Duna
>Mannded Duna landing and return
>Make huge space station in Kerbin orbit
>Turn it into a huge ship by docking engines
>Fly to Jool and visit all the moons
>Have spare fuel so decide to do a grand tour of the solar system
>Finally done everything I came out to do. Start playing other games
>Be me 2016
>Load up KSP after new update to check it out
>Jeb still stranded on Mun
Was this review helpful? Yes No Funny
262 of 280 people (94%) found this review helpful
149 people found this review funny
280.5 hrs on record
Posted: May 31
If you have kids, get this game for them. If you don't have kids, get this game anyway.
Was this review helpful? Yes No Funny
243 of 259 people (94%) found this review helpful
191 people found this review funny
227.7 hrs on record
Posted: May 31
ruined my ability to enjoy science fiction movies.
Was this review helpful? Yes No Funny
142 of 151 people (94%) found this review helpful
66 people found this review funny
15.6 hrs on record
Posted: June 3
This is Major Jeb to ground control
I'm stepping through the door.
And I'm floating in one of the most peculiar ways.
And the stars look very different today.
~10/10, great game.
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88 of 103 people (85%) found this review helpful
107 people found this review funny
13.1 hrs on record
Posted: June 1
- Launched into space.
- Climbed outside to get science.
- Accidently let go.
10/10 would burn in atmosphere again.
Was this review helpful? Yes No Funny
56 of 62 people (90%) found this review helpful
8 people found this review funny
112.1 hrs on record
Posted: June 6
So i told myself when i reached 100 hours on this game i would write a review. Well, here i am.

So i got this game around summmer 2015, after wanting it for a long time.
The game had just left early access and was in beta. (I just want to point out that i am very attatched to this game)
I adore this game. Most of my summer was spent playing this. (Before you say that isn't possible, i would like to point out my hours didn't add up as I ran the game from the .exe rather than steam.)

I would, and have, recommend this game to anyone who enjoys the feel of success, science, exploration, engineering, space, cute green creatures who you shall become the merciless god of as you stack them on top of each-other and use them as landing gear.

The only slightly bad thing about this game is the learning curve. I know the 1.1 update added loads of tutorials, 'cuz the old ones were exeedingly bad, but you will spend around 5 - 10 hours before you can do anything useful. Needless to say though it is worth it, and soon you will conquer the solar system!

Or, y'know, just abuse the various bugs the game has... that's cool....

Anyway, thanks for reading this review. If it helps someone buy the game, or spread the word, or anything, then i'm glad.

-- Simple Concept
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57 of 67 people (85%) found this review helpful
89 people found this review funny
987.2 hrs on record
Posted: June 3
Picked up a copy during its early access, have been in love with it since.
Was this review helpful? Yes No Funny
35 of 44 people (80%) found this review helpful
2 people found this review funny
68.8 hrs on record
Posted: June 7
This is without doubt the best game i have played.
Was this review helpful? Yes No Funny
21 of 21 people (100%) found this review helpful
1 person found this review funny
841.6 hrs on record
Posted: June 14
This is one of my favourite games. Its simply amazing.

KSP is walking the fine line between a space sciency simulation and a comicly slapstick just for fun and giggles game.

Its harsh and unforgiving in the beginning, expecting you to know about the basic science of rocketry or fail over and over until you get it on your own. (Watch ScottManley tutorials if you want a head start)
I had trouble in the beginning even getting into orbit around the planet (or keeping my rocket upright on the way there) - but now I am planing missions to other planets, landing and returning - sending unmanned rovers to explore - or even bringing asteroids back home.

800 hours in and I feel like I am still just at the beginning.

»Mün or bust« - unknown (prob. Jebediah Kerman or KurtJMac)
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9 of 9 people (100%) found this review helpful
120.1 hrs on record
Posted: June 9
What starts out as a simple, often hilarious; almost lego-like rocket/spaceplane builder has an astounding depth when you look into the possibilities.

The game features a great incentive for advancing your ambitions, science. Science is spent on new technology and parts for bolder missions, and is earned by pushing your boundaries. First, you can explore around you. Take samples, and crew reports from your cute crew of little green simpletons, then maybe you take a simple rocket to outer atmosphere for the first time, take a crew report and get home alive with a nifty parachute.. and Bam! More science. A new part, and the plot thickens..

KSP begins as a goofy tinkering tool with rockets and develops into a full-blown space exploration and research SIM.
Getting a rock sample from the moon may be one of your hardest gaming achievements, as it was for me, but doing it brings reward like little else. The planning, the development and trial/error makes KSP a great learning tool. It's even NASA approved. It uses real world physics and simulated drag for winged aircraft. It uses realistic orbital-mechanics for planitary manuevers, and players use realistic many real-life elements mission planning.

Buy it for your kids, buy it for yourself. They'll enjoy goofing and experimenting; they might even get serious about it. Same goes for you; you will enjoy at least a few experimental flights/missions. Especially if they end in a giant explosion, as many early flights will. After that you might have a success or two, maybe a simple contract or research mission turns out to be easy and you start learning. Soon you'll have dreams of the stars.

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