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Kerbal Space Program
In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble fully-functional spacecraft that flies (or doesn’t) based on realistic aerodynamic and orbital physics.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.
What reviewers agree on
91 of the 104 reviews raise this.
“launch, crash, fix problem, launch, crash again, fix problem again, keep doing until i get it, i make it to the moon, plant flag, reenter atmosphere, heat shield takes the damage, heat shield explodes, parachute opens,…”
“This game has taught me that building rockets the size of Egypt will unfortunately not make it into orbit”
“For start it was too difficult to learn, but later it made me addicted to solve more and more difficult problems. One of my most favorited games for sure, its fun.”
17 of the 104 reviews raise this.
“So good I decided to stop pirating it and buy the actual game lol, got like 600 hours in it”
“Gotten back into KSP thanks to Artemis II (I'm certainly not the only one!) after feeling deeply disappointed with KSP 2 back in 2023. And wow, I've realised I forgot just how much fun this game really is. Career mode…”
“I have over 100 days of playtime on Geometry Dash in not even 2 years, so I play it very often. HOWEVER, KSP is so good that I got 68 hours of playtime in less than a month of having the game and I played it so much…”
13 of the 104 reviews raise this.
“I have thousand of hours on the launcher version, but the steam version works just as well, one of my favorite games to mess around with. Works great on Linux too!”
“Is fun Is smart game Is pickle Runs really well on poor hardware Yes do buy whole game + DLC”
“Downloaded because of Artemis 2 hype, Instantly hooked. I almost crashed into the moon 5.7 hours in. Its super easy to run on my old gaming laptop. The tutorial is confusing sometimes though, but still would strongly…”
8 of the 104 reviews raise this.
“I was recommended this game by my high school physics teacher of all people. It's not just some fun and challenging experience with some silly little guys, but also a wonderful opportunity to learn a lot about aerospace…”
“buy game learn game start career put jeb in orbit get jeb back down see contracts fly by the mun hard contract i try i did it leave soi get launched out of kerbins soi orbit sun uh oh 1 year later ingame kerbin comes…”
“After 50 hours, I have successfully NOT made it to the Mun. I have NOT become interplanetary. I haven't even made it to a consistent orbit! And yet I continue. Why? ROKT.”
6 of the 104 reviews raise this.
“I have over 100 days of playtime on Geometry Dash in not even 2 years, so I play it very often. HOWEVER, KSP is so good that I got 68 hours of playtime in less than a month of having the game and I played it so much…”
“I think that this game is great for someone who likes space and rockets. I do think that you need to keep your expectations on graphics low as this game is old but that can be mostly fixed with mods. Otherwise I think…”
“I bought this game to quench my hunger for space flight simulator 2 and it does just that. its confusing at first with the building but once you get it figured out its pretty fun. Its worth the price if you have a…”
17 of the 104 reviews raise this · 16 of them still recommend the game.
“For start it was too difficult to learn, but later it made me addicted to solve more and more difficult problems. One of my most favorited games for sure, its fun.”
“I bought KSP back in 2015, played ten hours, got overwhelmed, and left it to rot on my steam shelf. Fast‑forward to 2026: Artemis II happened and suddenly my brain went: “Hey, why not send green astronauts and pretend…”
“Tytuł grywalny, ale wymagający cierpliwości (i modów) Gra nabiera sensu dopiero po zainstalowaniu modyfikacji – bez nich wiele mechanik kuleje. Największą bolączką jest system zarządzania ekwipunkiem i sortowania…”
5 of the 104 reviews raise this · 4 of them still recommend the game.
“launch, crash, fix problem, launch, crash again, fix problem again, keep doing until i get it, i make it to the moon, plant flag, reenter atmosphere, heat shield takes the damage, heat shield explodes, parachute opens,…”
“Gotten back into KSP thanks to Artemis II (I'm certainly not the only one!) after feeling deeply disappointed with KSP 2 back in 2023. And wow, I've realised I forgot just how much fun this game really is. Career mode…”
“wanted to go to urlum put jeb in my rocket that took me 3 hours to build gimbal doesnt work and jeb starts spinning jeb dies jeb then respawns just to go in "squizshit mk15" straight towards the sun 10/10”
4 of the 104 reviews raise this · 1 of them still recommend the game.
“Tytuł grywalny, ale wymagający cierpliwości (i modów) Gra nabiera sensu dopiero po zainstalowaniu modyfikacji – bez nich wiele mechanik kuleje. Największą bolączką jest system zarządzania ekwipunkiem i sortowania…”
4 of the 104 reviews raise this · 2 of them still recommend the game.
“Good game, good developers but an awful publisher However: They increased base price for a 11 year old unsupported game from £30 to £33 recently, Which is absurd since it's on offer every few weeks and the developers…”
“Tytuł grywalny, ale wymagający cierpliwości (i modów) Gra nabiera sensu dopiero po zainstalowaniu modyfikacji – bez nich wiele mechanik kuleje. Największą bolączką jest system zarządzania ekwipunkiem i sortowania…”
“Compralo en oferta, hacé los tutoriales. Mirate el video de la Nasa sobre mecánica orbital. Cebate viendo videos de como armaron la ISS, las misiones apolo y artemis. Y por último ponete a recrear las misiones que más…”
3 of the 104 reviews raise this · 3 of them still recommend the game.
“If you are considering buying this game, BUY IT! its very fun but i would reccomend getting visual mods like volumetric clouds and Restock, you can get them using ckan (installs them for you) or you can get them manually”
“I think that this game is great for someone who likes space and rockets. I do think that you need to keep your expectations on graphics low as this game is old but that can be mostly fixed with mods. Otherwise I think…”
“Best played with visual improvement mods, I suggest using the mod manager CKAN. Base game without mods is still terrific!!”
Counted across 104 English reviews, sampled to match this game's 95.2% positive rating · as of 2026-05-20
“--{ Difficulty }--- ☐ A toddler could play it ☐ Easy ☑ Normal (Everything else) ☐ Hard ☐ Absolutely insane ☑ Dark Souls (building the car if its your first time) ☐ Free to adjust ☐ Depends on who you are up against ---{ Gameplay }--- ☑ Very good ☐ Good ☐ Meh ☐ Watch paint dry…”
— a player, Steam review · 10 hrs played“got it today for 10 dollars, spent an 30 minutes trying to figure out how to place a capsule, finally figured it out, tried to send a tiny little rocket out of the atmosphere, failed, killed bob and valentina, jeb and bill are MIA, then spent an hour or two trying to find jeb…”
— a player, Steam review · 140 hrs played“Such a great game. Been playing for well over 10 years. Super cool to see the resurgence due to the Artemis missions We don't talk about KSP 2. This is the one you buy”
— a player, Steam review · 897 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-07-11 11:55 UTC · history via SteamCharts.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
KSP x Youtooz plushies now available!
Official KSP plushies are now available to pre-order for the next 4 weeks only: https://youtooz.com/collections/kerbal-space-program. Get them before they are gone forever!
Blast into Summer with Kerbal Space Program 2
Happy Summer, Kerbonauts! 🔆 Kerbal Space Program 2 is at a discounted price of 20% off until July 13th at 1PM ET. Join us in the Early Access journey into the stars and experience exciting new feature
Kerbal Space Program 2 Early Access is Out Now!
Kerbonauts, it’s finally time! Kerbal Space Program 2 blasts off into Early Access today! Pioneer the game with us as we enter the deep space journey of Early Access. Your feedback and suggestions can
Small Patch
Hello Kerbonauts! We are pushing an update to the launcher today. Most notably, the launcher will no longer remain open or run in the background after you launch Kerbal Space Program. We are also addi
Intercept Games Discord Now Live!
Hey Kerbonauts, our Official Discord is now live! Join today and get ready for the launch of KSP2! Join here: Intercept Games Discord
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-20.
| Genres | Indie, Simulation |
| Player tags | Space · Simulation · Sandbox · Physics · Science · Space Sim · Building · Moddable · Indie · Education · Open World · Singleplayer (SteamSpy community voting) |
| Features | Single-player · Steam Trading Cards · Steam Workshop · Partial Controller Support · Steam Cloud · Family Sharing |
| Languages | English, Spanish - Spain, Simplified Chinese, Japanese, Russian, French, Italian, German, Portuguese - Brazil |
| Estimated owners | 2,000,000 – 5,000,000 (SteamSpy) |
| Official site | https://kerbalspaceprogram.com/ |
Minimum system requirements (PC)
Minimum: OS *: Windows 7 SP1+ Processor: Core 2 Duo 2.0 Ghz Memory: 4 GB RAM Graphics: DX10 (SM 4.0) capable, 512MB VRAM Hard Drive: 3 GB HD space