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 (407 reviews) - 94% of the 407 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,219 reviews) - 97% of the 31,219 user reviews for this game are positive.
Release Date: Apr 27, 2015

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Recent updates View all (34)

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!

219 comments Read more

September 5

Update 1.2 has entered Experimental testing!

Hello Kerbonauts!

Update 1.2 has just entered Experimentals! We’re eager to finally start the next phase of testing and getting ever closer to the 1.2 release.

During experimental testing a crack team of experienced and hand-picked KSP players will throw everything they’ve got at the game to make it bend, blend and break in many ways. The goal is to catch as many bugs as we can, and to make the game as stable as it can be before we make a public test build available.

Those of you who’ve been around for the 1.1 update will remember that we released a ‘pre-release’ test build for everyone to have a go before we officially released the update, and for update 1.2 we plan to do the same thing. Once the pre-release builds are available you’ll only be able to opt-in via the Steam betas, or through the KSP store.

We hope you’re as excited as we are about the coming weeks. Stay tuned for updates and Fly Safe!

209 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 (407 reviews)
Overwhelmingly Positive (31,219 reviews)
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24,904 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
84 of 93 people (90%) found this review helpful
80 people found this review funny
43.5 hrs on record
Posted: September 4
A wise man once said:

"If at first you don't succeed, add more mainsail thrusters."

This man was correct.
This man was me.
Was this review helpful? Yes No Funny
66 of 70 people (94%) found this review helpful
52 people found this review funny
296.5 hrs on record
Posted: September 1
Top 5 things that taught me orbital mechanics:

5. Apollo 13 (1995, Tom Hanks, Bill Paxton, Kevin Bacon) ~$13 []

4. Highschool Physics (Newtonian Mechanics) ~Free [Australian Education System]

3. Undergraduate Physics Degree (Keplerian Motion, One body mechanics) ~$8000 /year [UQ]

2. Postgraduate Physics Degree (Analytic two-body solutions, computational Runge-Kutta simulations) ~$10000 [UQ]

1. Kerbal Space Program ~$30
Was this review helpful? Yes No Funny
31 of 32 people (97%) found this review helpful
20 people found this review funny
297.7 hrs on record
Posted: September 13
Nothing will prepare you for the moment you first touch down on the Mun with your Kerbals - alive. The sense of accomplishment is magnificent.
Its probably comparable to the crushing defeat you feel as you realize you forgot to make sure you had enough fuel to get back home.
But! You've done it! You managed to get your Kerbals to the Mun, land them safely, lift off and get into an aerobrake orbit around Kerbin!
Aaaand, you forgot to put parachutes on your command pod :|
Was this review helpful? Yes No Funny
37 of 45 people (82%) found this review helpful
29 people found this review funny
6.3 hrs on record
Posted: September 5
Launched rocket; watched it explode.
Made adjustments and launched rocket; watched it explode.
Made more adjustments and launched rocket; landed it successfully. Watched science explode.

10/10 Michael Bays.

You should definitely buy this game if you like physics and explosions.
Was this review helpful? Yes No Funny
61 of 86 people (71%) found this review helpful
77 people found this review funny
10 of 11 people (91%) found this review helpful
13 people found this review funny
261.2 hrs on record
Posted: September 16
Harder than dark souls.
Was this review helpful? Yes No Funny
6 of 6 people (100%) found this review helpful
469.1 hrs on record
Posted: September 25
Kerbal Space Program, at least to me is the king of simulation games. While I play numerous others (such as Farming Simulator) they don’t seem to hit every mark in that field. KSP, while challenging at first is the one that throws everything that happens in reality at the player, and force them to deal with it. While a game like Farming Sim only really requires you to keep an eye on fuel or some crops, KSP requires that you maintain a healthy supply of necessities ranging from fuel and electricity, to a satellite connection back home. But the part of the game that truly shines is the feeling you get when you first land on the Mun. A friend who gave the game a shot said
“it was just...pride. So many Kerbals died in previous attempts, and I finally made it.”

While the game is difficult, I can’t stop asking people to try it. To me, it’s the perfect “life isn’t about the destination, but the journey” and I think this game captures that perfectly.
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5 of 5 people (100%) found this review helpful
44.5 hrs on record
Posted: September 21
As goofy as the game seems, you will NOT find a more in depth and accurate space flight simulation out there yet.

At first, it's fun to build explosive and cobbled together monstrosities to launch into space and send crashing back to the ground, but then you learn the basics. Then suddenly a successful Mun landing becomes a point of pride and the next planet over becomes your new goal.

The career mode starts you with simple parts, to be expanded through scientific discoveries and contractual financial incentives.

Jebediah recommends this game to anyone worth their salt in a tin can floating among the stars.
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5 of 5 people (100%) found this review helpful
4 people found this review funny
55.9 hrs on record
Posted: September 20
Kerbin, We have a problem...

-Bill Kerman in the command pod next to Jeb, who opened the hatch during re-entry.

Fist of all, I played this game for a LONG time, way before the 1.0 release (not on steam, no)

To be honest, the is probably the best game I ever played in my whole life. I mean, I'm a astronomy nerd for almost 9 years and trust me... This is real space travelling. This game will entertain you for the rest of your life and if you like astronomy/airplanes or looking at a star during night at all, this game can't go wrong. This game allows you to play in 3 different modes and the ultimate goal is to explore different bodies and complete researches. However, the 3 different levels has their own way of fun too.

11/10 would complete a Jool all-moon landing mission and forget to bring parachute when going back to kerbin
12/10 would attach a solid booster to a VTOL
13/10 would unorbit a space station that I built for 10 month just to see the solar panels snap
14/10 would spend 200 hours of the game calculating and design a ship so that it will glich through Jool
15/10 would spend 2 hours trying to make a kerbal dance on the Narrow-Band Scanner (you can do that)
16/10 would blast a kerbal with a kerbodyne engine to let it fly
17/10 would script edit and make the sperators have 10,000,000 ejection force and name it "velocity injector"
18/10 would slingshot around all the moons in Jool and glich through Jool, launching yourself at 5,144,255,345m/s
19/10 would build an aircraft carrier then attach a F22 to it and build a aircraft sling shot using the "velocity injector" (it crashed)
20/10 would 9/11 the VA... I mean nothing
21/10 will play kerbal for the rest of my life!

IT WORTH YOUR 39.99 BUCKS!!!!!!!
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4 of 4 people (100%) found this review helpful
14.0 hrs on record
Posted: September 18
And they say minecraft is educational. No, THIS is educational, orbital mechanics, maths and lots of fun.
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Recently Posted
5.1 hrs
Posted: September 29
I no nothing about rockets. My friend does. I asked for help. He told me planes were easy. I made a plane. I made a sh*ty plane, I thought it was good. There were 20 Kerbels in it. I turned out me friend lied. Kerbals rained from the sky. The plane became a submerien.

Helpful? Yes No Funny
57.3 hrs
Posted: September 29
its awsome i love this game it is the best space games ever just add the update from the real version not on steam with connections andsuff like that please and this game will be perfect
Helpful? Yes No Funny
Count Danku
49.5 hrs
Posted: September 29
Can't stop and wont stop playing this game. The amount of the things that you can do is amazing. 10/10 would play again...if i could stop...
Helpful? Yes No Funny
1,525.8 hrs
Posted: September 29
I very positively feel as though KSP deserves an overwhelmingly positive review.

As of the present, I've enjoyed each moment (mostly) of the 1525(+) hours of my life that I can't get back, all donated to the "play" of KSP.

From creating Deathships(tm), to blowing the snot out of KSC with the coolio weapons mod, to running up the 'Roster of the Dead,' and just making a hazardous nuisance of myself in the (short) lives of the hapless Kerbals, my KSP experience truly has been overwhelmingly positive.

Oh yeah and edumacational too. :-)
Helpful? Yes No Funny
6.5 hrs
Posted: September 29
This is a fun game for those who like rockets or building and flying them!
Helpful? Yes No Funny
660.4 hrs
Posted: September 29
i love everything in this game even the things i hate. its a good game and the mods are wonderful. its a game and it was finished i hope they keep working on the game and polish it to make it as good at it can be but other than the craken paying you a visit now and then i have had no problems with bugs but god this game takes time a lot of it and a love for space if you dont have both you probly wont get much enjoyment out of it except maybe blowing stuff up in sandbox
Helpful? Yes No Funny
142.7 hrs
Posted: September 28
Well balanced and rewarding to progress through. The combination of sandbox, career (story) and science modes make it a good fit for a variety of players.
Helpful? Yes No Funny
Resident Hobo
35.1 hrs
Posted: September 28
Should have stayed in early access
Helpful? Yes No Funny
Womple Triffen
41.7 hrs
Posted: September 28
after 31 hours i finally landed on the moon. 10/10 would spend 31 hours again
Helpful? Yes No Funny
490.6 hrs
Posted: September 28
I absolutley recremend this game. I have had it before its official release and it is so much fun. The game is really easily modable. The mod base is something all games should be envious for. Get the game. GET IT NOW!!!
Helpful? Yes No Funny