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:
Overwhelmingly Positive (29,549 reviews) - 97% of the 29,549 user reviews for this game are positive.
Release Date: Apr 27, 2015

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Recent updates View all (30)

April 28

Kerbal Space Program patch 1.1.1 is now available!

Hello everyone!

The 1.1.1 patch is now available! This patch will bring high priority fixes to the game. Although last week’s release of 1.1 went smoothly, there were still a few bugs left to fix. Considering we updated the game’s engine we’re all very pleased with the overall state of the game. Those of you who were around for the switch from Unity 3 to Unity 4 in version 0.18.4 will certainly remember how much impact changing the game engine can have on the game’s stability.

Check out the full changelog on our forums. The update should start downloading through your steam client automatically soon™.

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April 19

Kerbal Space Program update 1.1 “Turbo Charged” is now available!

Hello everyone!

Kerbal Space Program is “Turbo Charged” by the release of patch 1.1!

After almost a year of hard work our major update is finally here! In the package you’ll find a large boost in performance due to the upgrade to the Unity 5 game engine, 64 bit binaries for Windows and OSX that will help you mod the game to ridiculous lengths and the brand new KSPedia reference guide for all the information you need to play the game!

That’s not all though, here are some of the highlights for this patch:

All new user interface
The user interface has been rewritten from the ground up to take full advantage of Unity 5’s new integrated systems. The ‘parallel’ UI systems have been removed and the game now uses only one system, adding to the performance bonus the update already brings. Almost all interface elements have been redesigned and tweaked but have retained the familiar feel for experienced players. The most notable tweaks can be found in the map view, staging, IVA portraits and the right-click part menus.

KSPedia will be the primary source for information on just about anything in the game. New players will find the basics of building and flying explained here, and more experienced players can take in information about more advanced concepts such as docking, in-situ resource utilisation and all the information they need to plan a successful mission to the next planet or moon.

New tutorials and scenarios
The tutorials have been extended and reworked from the ground up. The new tutorials will cover topics ranging from basic and advanced construction and flight, to docking and landing on Mun. Learn how to execute the perfect gravity turn, orbit Kerbin and land the Eagle. New scenarios unlock advanced mission concepts to any player: use a spaceplane to re-enter the atmosphere and land it back on the runway at the Kerbal Space Center, return a craft without heat shield from Duna, or beat SpaceX at their own game by flying back the first stage of a rocket to the launch pad.

You can find the complete changelog here. Kerbal Space Program 1.1 is now available on the KSP Store and on Steam, and will soon be available on other third party platforms.

408 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
Helpful customer reviews
3,858 of 3,965 people (97%) found this review helpful
1,187 people found this review funny
29.1 hrs on record
Posted: November 30, 2015
My 8 year old son broke away from Minecraft today. He sat on my lap while we made a rocket. He asked questions about rockets. We made it into space and he asked, "Are we in space?" We came down and the friction caused our heat shield to glow. His eyes were wide open as we slowed down. We pressed the space bar to deploy our parachutes but were going too fast and our chutes failed. We crashed and he asked if the kerbal was OK. I said yes as I hit ESC and went back to the VAB and changed a few things. A few minutes later, we landed our capsule safely and he had the biggest smile on his face. I haven't heard a word about Minecraft since! Thank you for making this wonderful game!!!
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1,588 of 1,759 people (90%) found this review helpful
1,834 people found this review funny
1,236.7 hrs on record
Posted: November 5, 2015
I think I may have a problem.
Was this review helpful? Yes No Funny
566 of 602 people (94%) found this review helpful
594 people found this review funny
120.3 hrs on record
Posted: February 9
This game is like a toast...

  • Your first attempt at toast looks pretty good, but you end up burning it.
  • You don't give up, after several attempts you make some better toasts
  • Those toasts taste awful and one nearly burns your entire house down
  • Desperate for toasting glory you search for some toast videos on youtube
  • All these people making enoromous and gloriously looking toasts make you jealous and sad
  • One day, you discover that you sorta don't need to make overcomplicated toasts to enjoy your snack. You also notice tiny differences between toasts and their preparation
  • You finally enjoy a proper toast, but the more you eat, the hungrier you get
  • Your hunger for toasts gets bigger and bigger with every known recipe
  • You start modifying your snacks and try challenges from other toast fans
  • You achieve toasting heaven, nothing can stop you now, you have mastered the art of toast. You begin preparing your masterpiece.
  • After several hours of hard work you end up burning it.
  • You look back at all your progres, and you realize that you don't have to make every toast perfect. It's in the dedication, will to learn from your mistakes and enjoying little victories on long and hard path.

This game is sweet combination of pride, joy and relief you'll feel after every successful mission although you also get hours of excrutiating pain, swearing and mental breakdowns. Get this game for full price, it's worth every penny.

...and I like toasts.
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1,231 of 1,366 people (90%) found this review helpful
645 people found this review funny
86.0 hrs on record
Posted: December 12, 2015
Started playing this game when I was 11, it was too complicated for me. I'd spent over 20 hours trying to reach the moon but always failed.

I'm now 14 and I've finally reached the moon and back.

10/10 - would wait 3 years until I'm mature enough to understand a game again.

Edit: For those saying the game came out last year, the first public release of this game was on June 24, 2011. Its official release out of beta was last year (2015).
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177 of 181 people (98%) found this review helpful
24 people found this review funny
293.8 hrs on record
Posted: February 3
I promised myself that I would write a review of this game as soon as I passed 100 hours, so here goes nothing.

The best space game on Steam. Period.

My first launch in Kerbal Space Program, or KSP as it is more commonly known, was a mess. It consisted of a one-man command pod, a solid rocket booster, and a parachute. When I hit the Space button (pun intended), everything set off at once; the solid rocket booster ignited at the same time as the parachute deployed. This resulted in poor Jebediah and his pod crashing into the KSC. Oh well.

Now, a hundred hours into the game, I have expanded my space exploration. A standard, fully functional manned orbiter is ready for launch anytime I want to play George Clooney and Sandra Bullock, minus the debris. Three geographical satellites are orbiting the Mun. And my biggest achievement? A small, scientific probe on the surface of Eve (the game's Venus equivalent), defying the extreme pressure and insane temperature to conduct scientific instruments. Eve Base 1 reads 400 degrees Celsius. Eve Base 1 does not care.

This is perhaps the best part of Kerbal Space Program. You learn throughout the game. Your tenth rocket will be far more advanced than your first one. Your Duna rover will be far more impressive than the small probe you landed (crashed) into Minmus. This game allows you to learn from your mistakes in an amazing way which is hard to describe. If something goes wrong, you figure out the problem. You try a new version of your spacecraft. It has a new problem, which you solve. And another problem. But eventually, your rocket is excellent, and to quote Ridley Scott's film adaption of The Martian: Solve enough problems and you get to go home. This game encourages and inspires you to fix your problems, and it does so in a way that is praiseworthy.

It's incredibly fun, too. Watching a rocket tilt and explode seconds after launch and seeing Jebediah's extatic face as his command pod falls towards the ocean at 100 m/s is enjoyable, in a slightly sadistic way. Watching a rocket achieve orbit and deploy its payload is fantastic. The same can be said for a close Moho flyby, or a successful landing on the Mun. When you achieve success in this game, there's a feeling which runs through you which can only be called a victorious feeling.

Moving on to other things, I guess it's time to mention the diversity. This game has an extraordinary variation in pretty much everything. We'll start off with parts. You have a massive selection of everything from batteries to 81-ton fuel tanks. You can use these parts to create anything you want. Rockets. Space stations. Satellites. Giant vibrators. Nothing will stand in your way. Well, except physics.

Continuing with diversity: Planets and moons. Despite limiting the player to a fictional solar system, this game does space exploration better than any game i've seen, and the planets and moons are perhaps the most important parts of this. None of the planets are actually planet-sized; they are many, many times smaller than their real-world counterparts. However, they are still large enough to make exploration extremely, and I mean extremely, interesting. Okay, I won't lie. Some parts are a bit boring. The Mun is grey and dull, as is Minmus. And you must be a truly boring person to find any interest in exploring the Dunian moon of Ike. But on the other hand: The thick atmosphere and the massive lakes of Eve makes any mission there worth it, the surface of Duna provides many interesting experiences, and going to the Joolian moon of Laythe just to watch the gas giant of Jool rise in the horizon is most definitely worth it. The game has fourteen explorable planets and moons, and you can spend literal days exploring one. Speaking of exploring, you can do this in any way you want - rovers, probes, manned landers, spaceplanes, essentially everything modern space travel has to offer.

And then there's the physics. Many space games, enjoyable as they may be, does not give realistic physics. And while this can be pleasing, it also removes a layer of enjoyable difficulty. But while many games fail at space physics, Kerbal Space Program absolutely nails it. The physics are so good that Elon Musk - you know, the guy behind SpaceX and Tesla - as well as NASA engineers have praised this game. You can do real-world orbital maneuvers, transfers, prograde burns and basically everything NASA loves doing. Never have I found physics to be this enjoyable.

The graphics are interesting. The rockets and spaceships look beautiful, as does the thrusters. The blue flame of a KS-25 "Vector" booster is immensely beautiful. On a larger scale, it's a bit more complicated. Most planets look very nice from a distance, and acceptable on the surface, but when you're in a low orbit around Kerbin you can't help but notice how plain it looks. It's not bad, but it is dissappointing in a way. Of course, there are mods that can fix this, and I will come back to that soon. And every thought of the graphics being bad dissappears the moment you see that sunrise.

Now that we're on the bad stuff, I guess there are a few things. Most notably, a mysterious crash boots me out of the game every five hours or so. And some warp mechanics are a bit dodgy. Same can be said for certain UI glitches. Anything else? Thinking...thinking...not really.

So, back to the good stuff, which KSP seems to be a never-ending source of. I shall conclude this review with mods. Oh, the mods. Many games does modding very well; i've had X-wings in Skyrim and Mass Effect battles in SW BF:II. But Kerbal Space Program has one of the best modding communities i've seen. To start off, we got basic fan-made part packs which covers some of the parts the game should have, but lacks. Then there's entire hangar packs which gives you a whole new way of sending Jebediah into space on questionable rocket designs. In addition to the parts, you got mods which adds whole new layers of gameplay; orbital scans, autopilots, upgraded base systems - just to name a few. One of my mods add amazing atmospheres to Kerbin, Eve, Duna, Jool and Laythe (there's something creepy but awesome about Eve's thick, Venus-like atmosphere). Another mod adds orbital scanners which allows me to map entire planets for future missions. Another mod gives me cameras which can be used for rocket launches and satellites alike. I got a mod which adds Soyuz (or "Soy-Juice", as the mod description says) pods, a mod which adds extra SRBs for extra explosions, and a mod which gives me a bigger and better atomic engine for those interplanetary missions. And so on.

I think i'll conclude here. So, the pros and cons.

- Amazing variety
- Perfectly executed "learn from your mistakes" gameplay
- Beautiful physics engine
- An unmatched modding community

- A small amount of annoying bugs
- Graphics could be slightly better

Final score: 9.8/10
This game offers space exploration as never seen in a spacey wacey game before, at least not to my knowledge. If you have even the slightest interest in physics, space travel or astronomy, buy this game. Just do it.
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