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 (630 reviews) - 93% of the 630 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,648 reviews) - 97% of the 31,648 user reviews for this game are positive.
Release Date: Apr 27, 2015

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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.

227 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 (630 reviews)
Overwhelmingly Positive (31,648 reviews)
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25,200 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
23 of 24 people (96%) found this review helpful
218 people found this review funny
1,421.4 hrs on record
Posted: September 28
Just remember to eat and drink occasionally.
Was this review helpful? Yes No Funny
13 of 13 people (100%) found this review helpful
5 people found this review funny
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.
Was this review helpful? Yes No Funny
11 of 11 people (100%) found this review helpful
2 people found this review funny
44.9 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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10 of 10 people (100%) found this review helpful
21 people found this review funny
85.0 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.

First 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 an 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. So, the basic mechanic of the game is you put together a craft in ANYWAY you want and with ANY PARTS you want! Then, you do the calculations for a specific mission (or not). They you fly it! You can build a plane and fly around, or build a rocket to go visit the different planets and the moons in the system! You can actually do anything you want in the game, capture and asteriod, dock to make a station or go mining on the Mun. So, learn REAL rocket science by starting this game!

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 catapult using the "velocity injector" (it crashed, the plane, not the game!)
20/10 would 9/11 the VA... I mean nothing
21/10 will play kerbal for the rest of my life!

Now, with the new update of 1.2, new communication networks and etc. The game got even better and even cheaper! So, with the 1.2 update, IT'S WORTH YOUR 23 BUCKS! And I think I made myself LOUD AND CLEAR!

haha... okay...
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5 of 5 people (100%) found this review helpful
2 people found this review funny
119.6 hrs on record
Posted: September 25
If you have even a remote interest in space and space travel, buy this game. Seriously. It's worth it.

There's a learning curve but when you learn how to play, it's very satisfying and rewarding completing contracts and exploring the solar system.

There's a huge modding community as well so you can make the experience even better with Realism Overhaul & Real Solar System to get as close to real life rocket ships as possible. (+hundreds of other mods like SpaceX rockets and other real life rockets and engines and graphic improvement mods.)

Seriously, this is one of the best games I've ever played. The development team (SQUAD) is very active and transparent with the community.
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3 of 3 people (100%) found this review helpful
41 people found this review funny
400.5 hrs on record
Posted: September 23
After over 300 hours ofplaying, this game crashes the most on my computer. I just recently had a game crash, and the window that said "KSP.exe has crashed" had crashed, then the window that said that last window crashed, then crashes.
Would crash again
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2 of 2 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
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2 of 2 people (100%) found this review helpful
1 person found this review funny
171.9 hrs on record
Posted: September 25
This game is amazing. There was a bit of a learning curve to figuring out the specifications needed for a space ship to reach its target, but with a little reasearch on orbital mechanics and rocket design, designing rockets became easier. It's such a satisfying feeling when you finally acomplish missions that took hours of hard work, I've even had to pull out the old pen, paper and FE approved calculator a few times while playing this game.
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2 of 2 people (100%) found this review helpful
249.7 hrs on record
Posted: September 25
Ok, first step... Build rocket, watch it explode.
Second Step: Build rocket again, launch it, then watch it dive bomb into the ground/water/mountain....
Third Step: Build rocket again, launch it, make it to the upper atmosphere and discover you didn't bring enough fuel....
Fourth: Build rocket again, add more fuel, launch, and finally get it into orbit.....
Fifth Step: Pass out from high blood pressure attack from actually getting into orbit and finding out you don't have enough fuel to return to the planet....

Sixth Step: Look at the clock and discover you forgot to go to work, feed the cat, ect.
Seveth Step: Return to step 1.

Bloody love this game! I acutally have more hours than posted, as I play this game on my laptop while on the road, usually at night so that I'm all stressed out.

Now the Cons:

[ ] Steep learning curve, unless you have high understanding of physic's, math, your already an Astronaut.
[ ] An i5 Intel CPU (or AMD equal) or better recommended
[ ] Lots of memory and graphics memory
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2 of 2 people (100%) found this review helpful
2 people found this review funny
212.8 hrs on record
Posted: September 20
Want to play a airplane sim? KSP. Space Sim? KSP. Moon lander sim? KSP. Anything related to physics sim? KSP.
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Recently Posted
249.5 hrs
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.
Helpful? Yes No Funny
Alex The Fetus
51.6 hrs
Posted: October 20
Don't Hack Gravity. It kills everything.
Helpful? Yes No Funny
85.1 hrs
Posted: October 19
Much to learn, much fun, much recommended. Scott Manley's Youtube tutorials helped me out a lot, every beginner should check those out. Fly safe!
Helpful? Yes No Funny
31.4 hrs
Posted: October 19
I have killed so many kerbals but I had a lot of fun doing it.
Helpful? Yes No Funny
45.7 hrs
Posted: October 19
This is one of the best games I have played for a long time. You design your own spaceship and launch it into space and attempt to conquer space. It has a very steep learning curve, but eventually you get the hang of it.
Helpful? Yes No Funny
Salamander Man
99.3 hrs
Posted: October 19
Cool game to play around with. Fun to build Rockets and Planes and seeing where you can get with them.
Probably the most realistic space game you can get, game will take a bit of practice before you really have fun. There will be alot of crashing and death when you first start playing but hey I guess it's kinda fun to watch the kerbals scream and panic when you make a mistake anyway, if you kill a few don't worry you can always recruit a few more. I only wish the planets had more things on them like trees or rocks to mine or somthing. Love the game Super fun!
Helpful? Yes No Funny
73.8 hrs
Posted: October 19
It really lets you unleash your creativity.
Helpful? Yes No Funny
Bob Johnson
20.6 hrs
Posted: October 19
BEST GAME EVER!!!!!!!!!!
Helpful? Yes No Funny
824.9 hrs
Posted: October 19
Still feels like beta. Ever since they released 1.0 new updates add some needed features, but every single one adds a new bug that doesn't get fixed for a while. I am writing this now after having my plane break apart on loading a game. It took off, flew into space, and landed many times before. Now, unexpectedly it breaks apart when I load tha game.

I am not surprised and this kind of thing happens a lot lately. We still don't have Delta-V or TWR calculators so you're never really sure if your rocket will reach its destination. There are mods to patch up parts of the game, but they lag behind and KSP doesn't provide support for them, but they rely on them to complete the missing features.

That said the game is fun for a while but eventually you will run into things like these. Just know that before buying.
Helpful? Yes No Funny
203.9 hrs
Posted: October 19
Amazing game, silly, funny, frustrating and all fun in the end! Practically endless things you can do with no mods, and if you end up running out of things to do (somehow), there are endless lists of mods you can install to enhance your experience further! And then we all have to love the kerbal physics. All hail the kraken.
Helpful? Yes No Funny