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 (646 reviews) - 93% of the 646 user reviews in the last 30 days are positive.
Overwhelmingly Positive (31,708 reviews) - 97% of the 31,708 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.

228 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 (646 reviews)
Overwhelmingly Positive (31,708 reviews)
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25,242 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
230 of 269 people (86%) found this review helpful
230 people found this review funny
1,434.5 hrs on record
Posted: September 28
Just remember to eat and drink occasionally.
Was this review helpful? Yes No Funny
95 of 98 people (97%) found this review helpful
5 people found this review funny
469.6 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
19 of 21 people (90%) 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.
Was this review helpful? Yes No Funny
12 of 14 people (86%) found this review helpful
1 person found this review funny
231.8 hrs on record
Posted: September 23
This game is pretty perfect. Don't buy it if you expect a story or an immersive career mode. Do buy it if you want to spend hundreds of hours building realistic-style rockets and trying to fly to the Mun, other planets and their moons, etc... and exploding spectacularly TONS of times.

A++ game
Was this review helpful? Yes No Funny
5 of 5 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
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
1 person found this review funny
178.2 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.
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
1 person found this review funny
257.3 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
Was this review helpful? Yes No Funny
4 of 4 people (100%) found this review helpful
1 person found this review funny
249.5 hrs on record
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.
Was this review helpful? Yes No Funny
21 of 37 people (57%) found this review helpful
42 people found this review funny
406.4 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
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
5 people found this review funny
511.3 hrs on record
Posted: September 30
You ever wonder what people mean when they say "It's not rocket science"?

Wonder no more.

This game is all about rocket science. Put in about 500 hours and when someone says "its not rocket science" to you, you can retort with "i know rocket science and im about to show you how much Delta V it takes to crush your kerbals with my boot."
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Recently Posted
Hugh Mungus
2,319.6 hrs
Posted: October 24
I still don't know how to do half the stuff in this game.
Helpful? Yes No Funny
5.8 hrs
Posted: October 24
I built a giant rocket and sent lots of people to space, rocket was to heavy so had to dump some people outta there, they died. Unfortunately. Then we came on mars and i dropped the last people out of my rocket, I went back home and left all of the people there, I think they died.

When I was home i started playing Kerbal Space Program.

10/10 would ♥♥♥♥ kerbins again
Helpful? Yes No Funny
6.1 hrs
Posted: October 24
I left Jebodiah in space, I#m a terrible person...


Would leave him there again.
Helpful? Yes No Funny
170.7 hrs
Pre-Release Review
Posted: October 24
KSP one of my long time loves, how I love thee.
Play this game, you will thank me, unless your a scoo, dont be a scoo
Helpful? Yes No Funny
486.5 hrs
Posted: October 23
- Create a hypersonic jet to test some in atmosphere limits
- Crew it with two unlucky ♥♥♥♥♥♥♥s
- Mach 4.5
- 5 km altitude
- pull up sharply
- Wings break off
- Jet goes into a flat spin
- Spinning so fast it's slowing its fall to <20 m/s
- Splashes down
- Both Kerbals survive
- Promptly send them out on another suicide mission

10/10 would kill Kerbals for "science" again
Helpful? Yes No Funny
Jack McNuggets
0.6 hrs
Posted: October 23
it smells like meat
Helpful? Yes No Funny
309.5 hrs
Posted: October 23
Just buy it, dont even think, youll never regret it! Hundreds of hours of fun!!!
(Just dont buy it if you dont have the money, dont hold me accountable if you do anyways)
99.5/100 Almost nothing to criticise, and less so every update! Just need mechasnical parts in vanilla...
Helpful? Yes No Funny
Trixie The Magnificent
0.5 hrs
Posted: October 23
Too hard to get into. Learning curve like running into a brick wall, nothing's explained or shown to the player, we're supposed to just figure out everything. I swear that nobody actually plays this game, because it's ♥♥♥♥ing impossible to do anything.
Helpful? Yes No Funny
0.4 hrs
Posted: October 23
It didn't work on my Ubuntu 16.10 x64. I tried starting it three times, and it always got stuck at some point while loading files (at a different point every time, even).

Why spend €40 for something that doesn't even support Linux decently?
Helpful? Yes No Funny
14.8 hrs
Posted: October 23
It's a bit hard for me to write the review of KSP with the limited gameplay I have, but I doubt I'll play it a lot more. And that's the reason why I can't recommend a game for 40 Euro. 40 Euro is supposed to give me more fun than 15 hours.

So why do I give up? It is still fun, and a lot of things that I am nowhere near of achieving, but it all comes down to how fun I find the flight simulation to be. This part is crucial to your success. I have the capacity to build a rocket to take me to the moon, but I as a player am not good enough at piloting it (yet) because I find it boring. And a lot of the things I still can do feels like grinding chores for scraps (or play sandbox mode with endless resources but where's the fun in that?).

In conclusion, if you like flight simulation of space shuttles, go ahead and get this one. But if you don't, save your money. Watching your carefully crafted rockets explode at takeoff and later achieve a wobbly, elliptical orbit that eventually slams it into the atmosphere at astronomic speed is only that much fun before it becomes frustrating.

By heresay, mods make things a lot better. But there's no steam workshop so I haven't tried them yet. If my playtime goes well above the 15 hours I have now, it's likely to be from playing with mods - and I won't change my recommendation based on mods.
Helpful? Yes No Funny