Kerbal Space Program has left Early Access, but you still have a chance at a Beta price. 1.0 comes packed with new features, optimizations, bugfixing, and tons more! Conquering Space Was Never This Easy!
User reviews: Overwhelmingly Positive (20,209 reviews)
Release Date: Apr 27, 2015

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"Early Access space ship building and simulation game, that combines challenge with humor. Fun, addicting, amazing community and mods to keep you busy."

Recent updates View all (16)

April 27

KSP 1.0 is Released!

Greetings, Kerbonauts!

This is a special one! After four and a half years in development, Kerbal Space Program 1.0 is now officially released!

Kerbal Space Program 1.0 is what we envisioned when development of the game started four years ago: we set out to make a game in which the player is given ultimate control over the exploration of space: from designing their rockets to launching and flying them to their destinations, in a universe that was modeled to be realistic, but at the same time still be fun to play in.

However, our 1.0 release is more than just a new version number. It’s also the biggest update to the game we’ve ever done, and contains many new and updated features, plus improvements to just about every game system, which we’re sure will appeal to both newcomers and seasoned veterans. These are the highlights:

The flight model has had a complete overhaul, meaning the lift is now calculated correctly to all lift-generating parts, which includes lifting bodies. The drag simulation has also been completely revised, and uses automatically pre-calculated data based on the each part’s geometry, to be finally applied based on not just the orientation of parts in flight, but also taking other parts into consideration. Stack mounted parts are now occluded from drag by neighboring parts, and lift induced drag is also properly simulated. Both the lift and drag are dependent on air density and the speed of sound, which are calculated from temperature and pressure. Be careful when flying aircraft in this new update: stalls are now properly simulated as well, and spontaneous craft disassembly during high-G maneuvers is now a very real thing.

A new heating simulation has been implemented together with the improved aerodynamics. Now, not only temperature but also energy flux is considered when making heat calculations, meaning radiative, conductive, and convective heating and cooling are all simulated and all parts have their individual thermal properties. Parts will emit a blackbody radiation glow if they get hot enough. Although part temperatures can now be affected by such things as being exposed to sunlight and hypersonic flight heating, they can be properly occluded from these effects as well. Atmospheric temperature (and density) takes into account latitude and the position of the Sun. Celestial bodies now accurately emit thermal radiation that makes nearby craft warmer. Finally, ablative heat shields (with a finite, editor-tweakable ablation material) have been added to protect the parts behind them from reentry heating.

You can now add fairings to your rockets! Fairing construction starts with a base part which will allow you to procedurally create a fairing after you place it. The design of the fairing is left up to you: shape individual sections of fairing with an intuitive visual system which gives you total control over the shape of any fairing.

Once you've placed the fairings you can still edit your payload! Mousing over the fairing will make it transparent and will give you an exploded view, allow you to access anything that's inside. If you later want to edit a fairing, simply right-click the fairing base to modify it as needed.

Fairings will shield anything inside them from drag and heat, making them an ideal tool for making payloads survive even more aggressive aerodynamic stresses. Like cargo bays and service modules, they will also prevent wings from generating lift, as well as science experiments, solar panels and antennas from deploying, which means all these new parts should be a big part of your mission design.

Resource Mining
Mining for Resources is now a part of Kerbal Space Program: set out to find Ore, which can be found throughout the Solar system, including on asteroids. To do this you'll have access to several different scanners to map out and find the best places to mine, drills to extract it, specialised holding tanks to store it, and a processor / refinery unit to convert it into usable fuels. To help you find the Ore, new map overlays have been implemented on all celestial bodies, and new UI elements have been added to various pieces of equipment. Also, Kerbal engineers are particularly good at keeping those drills humming at peak efficiency.

As always, you can find the complete changelog on our Forums.

There is a lot more we could talk about, but we’ll let you discover that on your own!

The update is now available on the KSP Store, Steam and GOG.

We hope you will enjoy Kerbal Space Program 1.0 as much as we enjoyed making it.

Happy Launchings!


380 comments Read more

December 15, 2014

KSP has gone Beta! v0.90.0 is Officially Released!

Hello everyone and welcome to version 0.90.0 of Kerbal Space Program: Beta than ever!

Version 0.90.0 marks the transition from alpha to beta development of the game and will introduce the final major components to career mode. This then is the version that makes the game ‘scope complete’: every major feature that the game was designed to incorporate now exists and from here on, development will shift focus from implementating new systems to improving the existing ones, adding content, polish, balancing and bug fixing.

The update contains many new features and updates to previously existing systems which combined make for quite likely the largest update in the game’s three year history. Here are the highlights:

Upgradable Facilities
In career mode the Kerbal Space Center will advance with your space program. Start out with small buildings and limited functionality and build up your facilities into a state of the art space center with capabilities to launch and manage every mission you’ve ever dreamt of doing. Each building such as the Astronaut Training Complex, Vehicle Assembly Building and Tracking Station can be upgraded separately (and destroyed and repaired too), unlocking new and exciting capabilities and bonuses to your space program. Choose where you spend your money wisely: constructing buildings is most certainly not cheap.

Kerbal Experience and Skills
Your Kerbals now have specific skillsets they will develop as they gain experience: Choosing from your available applicants now mean deciding between pilots, scientists and engineers, each adding abilities specific to their skill, and unlocking further abilities as they earn experience by going on missions in outer space. Pilots are able to take over control of your spacecraft’s orientation to provide stability control during flight; Scientists are better at collecting and analyzing experiment data, so their science skills give bonuses to science collection, data transmission, and lab processing; and an experienced engineer can repair specific parts of your craft which may just save your mission.

Editor Overhaul
Ship Construction has been almost entirely rebuilt from the ground up. The Parts list now allows you tolook up parts not only by function (category), but also by resource, module type, tech level and much more. In case you want to add your own custom categories, that’s possible as well, you can set up lists of your favorite parts and organize your subassemblies into subfolders. As if that wasn’t enough there’s also the option to sort the filtered parts by mass, cost, size and name.

Also new in the Construction Facilites are the Gizmos which will allow you to Offset and Rotate parts, giving you complete control over how they are placed. The functionality to set a new root part for your craft has also been added, so you don’t have to rebuild your entire craft if you decide the root part should be somewhere else.

Other than these, we've also added many other improvements and new features: Symmetry can be toggled between Mirror and Radial modes, in both editors; Crew assignment is now fully persistent as you build; A new Stats toolbar panel lets you see your craft's total mass, part count and size; the list goes on.

Mk3 parts
After the major overhaul on Mk2 spaceplane parts in version 0.25 there is now a lot more to choose from when it comes to the Mk3 spaceplane parts: the old Mk3 parts have given way to a total of 15 all-new parts of unprecedented size, capable of carrying truly enormous payloads. Really. You can fit an orange Jumbo-64 fuel tank inside those cargo bays!

More contracts
Kerbal Space Program version 0.90.0 also brings the Fine Print mod by Arsonide into the game. This addition brings a whole new array of contract types to the table for you to choose from, adding depth and diversity to the contracts system. Survey areas, deploy satellites in precise orbits, capture asteroids, construct orbital space stations and build bases on planets or moons. This isn't a simple mod addition however. Fine Print author Arsonide has worked with us to tweak the mod into the stock game seamlessly. It’s all included and should provide any player with a challenge suited to their skill level and interests.

More biomes
The biomes system has seen a major overhaul for the first beta release of Kerbal Space Program. With help from KSP enthusiast and streamer Tanuki Chau every planet and moon in the game now has new biomes players can go out and explore. From the canyons of Dres to the peaks on Pol, the game now counts over 100 unique biomes. Each of these places represents another location where your Kerbals can gather, analyse, recover and send data from.

These are the major changes for Kerbal Space Program update 0.90. For everything else, check out the complete changelog here:

As always, the update is now available on the KSPStore and Steam.

We hope you will enjoy Kerbal Space Program: Beta Than Ever as much as we enjoyed making it.


239 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
    • Processor:Core 2 Duo
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Windows 7 or 8 64 bit
    • Processor:Core i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
    • OS:Snow Leopard (10.6)
    • Processor:Intel
    • Memory:3 GB RAM
    • Graphics:SM3 512MB VRAM
    • Hard Drive:1 GB HD space
    • OS:Yosemite (10.10)
    • Processor:Intel Core i5
    • 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 i5
    • Memory:4 GB RAM
    • Graphics:SM4 1GB VRAM
    • Hard Drive:2 GB HD space
Helpful customer reviews
260 of 271 people (96%) found this review helpful
57 people found this review funny
77.1 hrs on record
Posted: April 27
This game should be standard issue in school physic classes. Taught me more about orbital mechanics than anything else.
Was this review helpful? Yes No Funny
617 of 699 people (88%) found this review helpful
410 people found this review funny
701.0 hrs on record
Posted: April 27
Early Access Review

Ruined Science Fiction Movies with now learnt knowledge of real-life Astrophyics
Was this review helpful? Yes No Funny
112 of 133 people (84%) found this review helpful
48 people found this review funny
124.1 hrs on record
Posted: April 26
Early Access Review
I've wasted hours of my life in this game, lost countless nights of sleep, $30, several friends, and hundreds upon hundreds of rockets.

11/10 would recommend. Plus it leaves beta tomorrow.
Was this review helpful? Yes No Funny
69 of 79 people (87%) found this review helpful
27 people found this review funny
59.7 hrs on record
Posted: April 26
Early Access Review
So im going to give you a short list of the pro's and cons and it will inevitably leave you with a sense of dread if this game is not already in your steam library (Shame on you!)

  • Endless Fun
  • Insane Modding Community
  • As complex or as Simple as you want
  • Has a career mode for those who need goals
  • when things go just as you planned you get a giant smile on your face and when then go horribly wrong you get a bigger smile.

  • There is only so much in the time in a day to play this game, so if you only have 30 minutes a week to play you might have trouble getting into it. (But you should still buy it to support this awesome game)
  • The game is not free (And it never should be.. buy it!)
  • If you suffer from having only 2 hands and 2 eyes you may find it difficult to control and micro-manage a space research empire (Warp'ers Bewaaaaare)

So thats my little list as to why everyone should own this gem of a game.
Was this review helpful? Yes No Funny
42 of 44 people (95%) found this review helpful
12 people found this review funny
94.8 hrs on record
Posted: April 26
Early Access Review
94 hours on record with the steam release, about several hundred more before the steam-based purchase.
I can hands down tell you, this game is on the top 3 of a 28 year old gaming streak, and it makes you dream, yearn for the stars.
It fires up your creativity to points even you didn't think were possible, it gives you hope for humanity's destiny.
It can teach you rocket science, to boot!

My experience in short:
Recreation of real extraatmospheric missions
Messing with the physics, with the power of your personal space program - in other words, airplanes with fifty rocket engines, droppods launched from orbit, "martian" colonization endeavours, decoupler-based propulsion, making your kerbals (the humanoid LGM you control) withstand mach 12 -- very educational, much smart. yes. Excuse me, I need to go launch things into a sun now.
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41 of 44 people (93%) found this review helpful
9 people found this review funny
560.0 hrs on record
Posted: April 27
This is legitimately one of the best video games ever created. People can learn about real life science and have lots of fun to go with it. And you can blow up space frogs.
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30 of 32 people (94%) found this review helpful
4 people found this review funny
176.0 hrs on record
Posted: April 26
Early Access Review
This game is worth twice the asking price!

If you're into science, learning, or just watching stuff explode, this game is for you!

1. Lots to do! You have an entire solar system and it's all yours to explore
2. One of the best communities around
3. MODS!
4. You will sink many, many fun filled hours into this game.

1. Steep learning curve
2. Can be frustrating from time to time
3. This game is going to
4. You will sink many, many hours into this game.
Was this review helpful? Yes No Funny
22 of 25 people (88%) found this review helpful
3 people found this review funny
253.4 hrs on record
Posted: April 26
Early Access Review
It's a fun game. Yes, the learning curve is pretty steep, but new versions of the game have made the learning curve more forgiving. It's an extremely fun and rewarding game to play. This is not an easy game, however, and if you don't feel like thinking and/or planning ahead then this probably isn't the game for you.
Was this review helpful? Yes No Funny
19 of 22 people (86%) found this review helpful
10 people found this review funny
163.2 hrs on record
Posted: April 26
Early Access Review
Yes you need to know how rockets fly to play this game without crashing every time. But after playing a bit you will want to learn how rockets work and maybe one day make a rocket yourself in your backyard....

...So I don't have a backyard anymore... bright side I now have a giant forever on fire pit who wants marshmallows...

10/10 best $30 ever spent. $1 for every hour theory very well spent.
Was this review helpful? Yes No Funny
18 of 23 people (78%) found this review helpful
7 people found this review funny
451.6 hrs on record
Posted: April 26
Early Access Review
It will make you want to watch actual rocket launches in exitiment
Was this review helpful? Yes No Funny
13 of 14 people (93%) found this review helpful
8 people found this review funny
276.6 hrs on record
Posted: April 27
Early Access Review
Absolutely Stunning Game 10/10.
Imagine you are the head of NASA but everybody that works for you is a little Minion from Despicable Me.
This game deceptively teaches you rocket science amongst all the wonderful explosions and stunning destinations.
The Trial and Error makes learning the game fun! For the first several days of playing I had an ICBM Factory as opposed to a Space Program.
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13 of 14 people (93%) found this review helpful
1 person found this review funny
64.4 hrs on record
Posted: April 27
Pre-Release Review
Very good game, if you'r into space. It will take hours off your life in a pleasant way :)
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11 of 11 people (100%) found this review helpful
1 person found this review funny
15.4 hrs on record
Posted: April 27
Pre-Release Review
Played this game in Alpha before it was on steam. This game just gets better and better. One of the only few early access games that actually delivered a well made product. The support and community behind this game are what makes it really good.

I always wanted a space shuttle in game and thanks to community made mods i now have that.

Fun game overall i highly recommend.
Was this review helpful? Yes No Funny
14 of 18 people (78%) found this review helpful
4 people found this review funny
253.0 hrs on record
Posted: April 26
Early Access Review
There are no words to explain how much I love this game. How can such a simple thing be so awesome. Brings out my old nerdy nice and makes wish I could go back in time and study phyics.
Was this review helpful? Yes No Funny
14 of 19 people (74%) found this review helpful
6 people found this review funny
10.3 hrs on record
Posted: April 27
Early Access Review
If your rockey doesn't launch try adding struts and boosters.
Was this review helpful? Yes No Funny
8 of 8 people (100%) found this review helpful
694.6 hrs on record
Posted: April 27
Pre-Release Review
While writing this I have almost reached my 700th hour and that does not even include the ones I played offline, so I'm probably more near the 800th hour. Nevertheless, this is one of the greatest games I've ever played. It's difficult, yes. But not as difficult as it sounds or appears first. Watch Scott Manley's tutorials on youtube and with a little practice and patience you will be able to do all the cool stuff you can imagine. I don't want to misslead you, it can be a rly hard and a even little frustrating during the first couple of hours, but it's also so damn rewarding once you got past that initial learning courve.
So what does this game offer? A huge sandbox experience with lots and lots of content that has been build up and polished for about 4 years! You want to build a rocket? a (space)plane? a shuttle? a station? a moon (mun) lander? or a probe that travels across the whole system to reach the gas giant far out? Than do that! No one is stopping you! Your imagination is the limit, as much of a cliche that might sound like. But it's true and if you don't believe, watch showcases of people on youtube. There is everything from Star War's podracers to real life replica missions.
And if you fail a couple of times, there is nothing bad about it. The game manages to make failures fun. How? Cause you see stuff spinning, crashing and exploding in ways you couldn't even imagine. This is the unique experience of KSP that I've been enjoying with the greatest community I've ever seen. If you have a question, than simply post it on the forum. There are so many experienced vets out there that help each other and especially the new people with theire knowledge and skill. It's a rly unique group of people that has kept the forum alive ever since the buggy first steps.
You may ask yourself where the hell you might take the inspiration to build stuff after 100th of hours. The answer is simple. KSP is easy enough to be fun once you get used to the basics, while still being acurate enough to build real life replicas from the Apollo and Space Shuttle Aeras to modern missions and design like SpaceX's reusable boosters or Virgin Galactic's space ship one. It's all within the possibilities of this sandbox.
And if you want something more SciFi orientated? Then get a mod like interstellar or near future and you will get everything and more right at hand. Even for the type of players that enjoy a harder and more realistic simulation type of game there are easy ways to do just that. The moding community of this game is just huge. There is everything from physics driven algorithms that simulate hypersonic reentrie effects to adding whole new planets and solar systems. There is just so much content out there that you will literally never be able to see or play it all.

Long story short, after playing this game for years I sudenly felt a need, driven by nostalgia, to write this down and promote the best investment I ever did for a game.

I hope you will enjoy it as much as I did and still do! Cheers
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9 of 10 people (90%) found this review helpful
8 people found this review funny
176.7 hrs on record
Posted: April 27
This is Major Jeb to Ground Control
I'm stepping through the door
And I'm floating
in a most peculiar waaaay
And the skybox looks very different todaaayayaay

For here
Am I sitting in a tin can
Far above the world
Planet Kerbin is blue
And there's nothing I can do


Though I'm past
one hundred thousand miles
I'm feeling very still
And I think my MechJeb knows which way to go
Tell Bill I love him very much
He knooooows

Ground Control to Major Jeb
Your circuit's dead,
there's something wrong
Can you hear me, Major Jeb?
Can you hear me, Major Jeb?
Can you hear me, Major Jeb?


10/10 - would slip the surly bonds of earth again
Was this review helpful? Yes No Funny
10 of 12 people (83%) found this review helpful
3 people found this review funny
104.4 hrs on record
Posted: April 26
Early Access Review
Absolutely amazing game. Learning curve is somewhat steep, especially for those with no rudimentary knowledge of physics, but the game a huge time sink. Also, the modding community is absolutely great. If you are somewhat frustrated when first starting check out youtuber Scott Manley, his tutorials kept me going at the beginning. That first time you land on the Mun is a great feeling.

Stop reading the rest of the reviews and buy the thing.
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5 of 5 people (100%) found this review helpful
1 person found this review funny
6.3 hrs on record
Posted: April 27
Pre-Release Review
Most likely the best space simulator ever made.

While there is a bit of a learning curve and it may take a while to actually be successful and good at the game, I do still highly recommend this to anyone with an itch or desire to build things and explore outer space. (Some youtube videos by Scott Manley or someone similar will help out greatly.)

And with it finally releasing in 1.0, it is now full with tons of various features and things you can do.

Lets also not forget that also the fun and exploration is near truly endless with the addition of mod support.

Graphics: 8.5/10

Audio: 8.75/10

Gameplay/Replay-ability: 9.25/10

Interface/Controls: 9

Mod Support: 9.25/10

Overall, I give this game a 9/10.
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6 of 7 people (86%) found this review helpful
7 people found this review funny
2,718.9 hrs on record
Posted: April 27
Yha, Its pretty good.
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