Kerbal Space Program

Kerbal Space Program
Developer(s) Squad
Publisher(s) Squad
Director(s) Felipe Falanghe[1]
Programmer(s) Alejandro Mora
Mike Geelan
Mario Maqueo
Rob Nelson
Marco Salcedo[1]
Artist(s) Daniel Rosas
Juan Carlos Demeneghi
Iván Vázquez[1]
Composer(s) Kevin MacLeod
Victor Machado
Engine Unity
Platform(s) Microsoft Windows
OS X
Linux
PlayStation 4
Xbox One
Wii U
Release date(s) Microsoft Windows, OS X, Linux
April 27, 2015[2]
PlayStation 4, Xbox One, Wii U
June 2016
Genre(s) Space flight simulator, sandbox
Mode(s) Single-player

Kerbal Space Program (commonly abbreviated as KSP or less commonly as Kerbal) is a space flight simulator developed by Squad for Microsoft Windows, OS X, Linux, PlayStation 4, Xbox One, and Wii U. In the game, players direct a nascent space program, staffed and crewed by humanoid aliens known as "Kerbals." The game features a realistic orbital physics engine, allowing for real-life orbital maneuvers such as Hohmann transfer orbits. The first publicly available version (version 0.7.3) was released as a digital download on Squad's Kerbal Space Program storefront on June 24, 2011.[3][4] The game became available on Steam's early access program on March 20, 2013, though Squad continues to offer a download through their storefront.[5][6] The game was officially released out of beta on April 27, 2015. Kerbal Space Program has support for game mods that add new functions or parts.[7] Squad has often integrated popular mods into the game, such as mods for resource mining[8] and context-based missions.[9] Notable people and agencies in the space industry have taken an interest in the game, including NASA,[10] the B612 Foundation,[11] and Elon Musk of SpaceX.[12]

Gameplay

A rocket (preloaded ship "Kerbal X") sitting on the launchpad with the Vehicle Assembly Building and Mun, Kerbin's nearer moon
In-game Kerbals, Valentina (female) and Jebediah Kerman (male), on the launchpad

The player controls a nascent space program operated by Kerbals, a race of small green humanoids, who have constructed a fully furnished and functional spaceport (known as the Kerbal Space Center, or KSC) on their homeworld Kerbin, which is modelled after Earth. Despite being shown as funny cartoon-like little green men, sometimes lacking common sense,[13] they have shown themselves to be able to construct complex spacecraft parts and perform experiments.

Gameplay consists of constructing rockets, aircraft, and spaceplanes out of a provided set of components and launching them from the in-game space center's launch pad or runway, then going on to complete player-set or game-directed missions while avoiding various opportunities for partial or catastrophic failure such as lack of fuel or structural failure.

Missions (either player-set or proposed in the form of "contracts" with set parameters to achieve) involve goals such as reaching a certain altitude, escaping the atmosphere, reaching a stable orbit,[14] landing on a moon or planet, capturing asteroids, and creating space stations and surface bases.[15] Players also set challenges for each other on the game forums, such as visiting all five moons of Jool (the ingame analog for Jupiter) or using mods to test each other's craft in air combat tournaments.[16]

Once a spacecraft is built, it is placed on the launchpad or the runway and is ready for launch. Players control a spacecraft in all three dimensions with little assistance other than a stability system to keep their rocket pointed at a player-specified direction or to keep a constant attitude.[17] If the rocket has enough thrust and fuel, it is possible to reach orbit or even travel to other celestial bodies. In flight, to visualize the player's trajectory, the player must switch into map mode. The map shows the orbit or trajectory of the current craft as well as the current position and trajectory of other spacecraft and planetary bodies.[17] Planetary bodies and other spacecraft can be targeted in order to view information needed for rendezvous and docking such as ascending and descending nodes, target direction, and relative velocity to the target. While in map mode, players can also access 'maneuver nodes' which can be used to plan out trajectory changes in advance.

Historical spacecraft can be recreated and their accomplishments mimicked, such as the Apollo program, the Mars Science Laboratory rover, or the International Space Station.[18] Players may also install mods which can implement destinations, weapons, rocket parts, and goals for the game, such as mining for resources or incrementally deploying an interplanetary communication network. Mods can also consist of informational displays showing craft and orbital statistics such as delta-V and orbital inclination. Squad has often implemented popular mods into the stock game, such as the "Karbonite" resource mining system made by user RoverDude.[8]

Game modes

The game can be played in three different game modes that are selected when the player starts a new game: "Sandbox" mode, "Science" mode, and "Career" mode.[19] In sandbox mode, players are free to attempt any mission for which they can construct a suitable vehicle, with no punishments for failure[20] (except the temporary death of Kerbals who may die during a failed mission) and entirely user-assigned missions. Many players have constructed unrealistic spacecraft in this mode, such as unrealistically huge, complicated, and/or extremely expensive rockets. Many players have also created replicas of real-life rockets and aircraft as well as replica and non-replica automobiles, trains and boats.

In Science mode, the initial selection of parts is limited, with the more advanced parts unlocked via "Science",[19] in the Research and Development building, gained by performing various scientific experiments on Kerbin and throughout the solar system. Science mode was partially designed to ease new players into the game and prevent them getting overwhelmed.[21] Science gained on a mission needs to be received by the space port.[22] This can be done by transmissions via antennas[19] in the game, or recovery by a craft landing back on Kerbin.

Career mode is an extension upon science mode, adding funds, reputation, and contracts. In order to build and launch new rockets, the players must complete contracts to earn funds to pay for the new parts. Reputation affects how many contracts are given to the player (less reputation leads to fewer and lower-quality contracts).[23] Declining a contract will reduce the likelihood that a contract of the same type will appear,[24] but also results in a small reputation penalty.[9]

Physics

While the game is not a perfect simulation of reality, it has been praised for its representation of orbital mechanics.[25][26] Every object in the game except the celestial bodies themselves are under the control of a Newtonian dynamics simulation. Rocket thrust is applied accurately to a vehicle's frame based on the positions in which the force-generating elements are mounted. The strength of the joints connecting parts together is finite and vehicles can be torn apart by excessive or inappropriately directed forces.

The game simulates trajectories and orbits using patched conic approximation instead of a full n-body simulation, and thus does not support Lagrange points, perturbations, Lissajous orbits, halo orbits and tidal forces. According to the developers, full n-body physics would require the entire physics engine to be rewritten.[27]

The in-game astronauts, known as "Kerbals", have physics calculations applied to them when they are on extra vehicular activities. For example, hitting an object with only the Kerbal's feet will send them into a tumble. While on EVA, Kerbals may use their EVA suit propellant system (analogous to the NASA Manned Maneuvering Unit) to maneuver in space and around crafts and space stations. Actions that can be performed while on EVA include repairing landing legs, wheels, and solar panels. Kerbals can also collect material from science experiments, allowing them to bring back scientific data without having to bring back heavy or bulky parts or risking destruction of the data and experiment during atmospheric entry.

Some celestial bodies have atmospheres of varying heights and densities, affecting the efficiency of wings and parachutes and causing drag during flight. The simulations are accurate enough that real-world techniques such as Hohmann transfers and aerobraking are viable methods of navigating the solar system. Aerobraking, however, has become a much more difficult method of velocity reduction since the full 1.0 release due to the addition of a better aerodynamics model and optional atmospheric entry/reentry heating. Atmospheres thin out into space, but have finite, set heights unlike real atmospheres.

Kerbal Space Program makes some changes to the scaling of its solar system for gameplay purposes. For example, Kerbin (the game's analog of Earth) is only 1200 km in diameter (approximately 1/10th that of Earth's). Kerbin's density is over 10 times that of Earth's, in order to produce similar gravitational accelerations at the surface. The planets themselves are also significantly closer together than the planets in our solar system. However, there are mods that port the real-world solar system into the game, with accurate scaling and environments, and provide additional parts to make up for the extra power requirements.

History and Development

The game's first public release was on June 24, 2011 with version 0.7.3.[3][4] The game entered beta on December 14, 2014, with version 0.90, and was officially released out of beta on April 27, 2015.

Pre-Development

Director Felipe Falanghe was hired by Squad in April 2010. At the time, the company did not develop software.[28] According to Falanghe, the name "kerbal" came from the names he gave small figurines he installed in modified fireworks as a teenager.[29] In October 2010, development on KSP was authorized by co-founder Adrian Goya but deferred until Falanghe had completed his projects in progress.[28] KSP was first compiled on January 17, 2011.[30]

Notable Updates

Alpha

Version 0.7.3

Version 0.7.3 was the first public release of KSP, and was released on June 24, 2011.[31] It was downloaded over 5,000 times.[32] The version lacked many features present in later versions, such as a stability assist mode. Kerbin did not rotate, and the sun was simply a directional light source. There were no fuel flow mechanics, no control surfaces, and no other celestial bodies.[31]

Version 0.22

Version 0.22 added "career mode" to the game. However, systems such as Contracts, Funds, and Reputation were not yet implemented, making this Career mode more like the Science mode of later updates. It currently only involved collecting science points from various locations, and using these science points to unlock new parts. It also featured new models for the Kerbal Space Center, and the ability to save and load collections of parts as "subassemblies.[33][34]"

Version 0.24

Version 0.24, titled First Contract and released on July 17, 2014, added the contracts and reputation system to the game's Career mode. (Players were still able to play Career without these features in the new Science game mode.) Contracts reward the player with currency, named "Funds" by the developers, and reputation. Funds can be used to purchase rocket parts, and reputation results in better and more lucrative contracts.[35][36]

Version 0.25

Version 0.25, titled Economic Boom and released on October 7, 2014, was the final alpha release of KSP. It added a new facility: the Administration Building. The Administration Building allows the player to put into effect various "strategies" that boost intake of one resource (Funds, Science, or Reputation) while reducing the intake of the other. For example, the player can choose to hire unpaid interns for the Research and Development Department, increasing intake of science while decreasing the amount of reputation earned. Version 0.25 also added the ability to destroy KSC facilities, which can then be repaired for a fee. Version 0.25 also integrated the SpacePlane Plus mod into standard KSP, reworking most of the aircraft components.[37][38]

Beta

Version 0.90

Version 0.90, titled Beta Then Ever, was released on December 15, 2014.[39] This was the first (and only) beta update to KSP. The update featured a full rewrite of the entire editor code, and now allowed for the ability to offset parts, sometimes into empty space. The update made several other improvements to the editor, such as the ability to sort parts by company, module, and mass, as well as the ability to assign parts to custom categories.

This version also implemented upgradeable buildings in Career Mode. When the player starts, they only have basic facilities allowing for small rockets with low mass and part count. The player can upgrade each of the facilities to increase mass and size limits, or unlock various other capabilities; for instance, a non-upgraded tracking station does not allow for placing maneuver nodes or for trajectory prediction using patched conics.[40]

Version 1.0

Version 1.0 was the first full release update of KSP. It was titled We Have Liftoff! and released on April 27, 2015. 1.0 completely overhauled the flight and drag model, making it far more realistic. Before version 1.0, drag was calculated on every single part, regardless of whether that part was occluded from airflow or not. 1.0 also allowed for body lift, so that parts that were not specifically designed as wings (for instance, structural panels) could still generate lift.

1.0 added shock heating and heat shields, making atmospheric entry much more dangerous. 1.0 also added procedurally modeled fairings, airbrakes, and new Space Shuttle-style parts. Internal models for all parts that previously did not have them were added as well.

Resource mining was added, based on the "Karbonite" mod by Roverdude. Players could now mine resources (named "ore") to refine into fuel or monopropellant.

1.0 also brought several improvements to Kerbals, who could now have various specializations. For example, "Engineer" Kerbals are able to repair wheels and landing legs. Female Kerbals were also added to the game.[41][42]

Version 1.1

Version 1.1, titled Turbo Charged, was released on April 19, 2016, almost one year after the last major update. The game engine was upgraded from Unity 4 to Unity 5, resulting in a massive increase in performance. Nearly all the game's UI elements had to be completely rewritten, and many other components (such as wheels) were also overhauled.[43]

On March 2, 2016, Squad announced an optional public beta for the 1.1 update. The beta ran for three weeks before the full release of the update, and allowed Squad to test the large update with a massive audience. The beta was only available to those who had bought the game through Steam, and not through Squad's store, Amazon.com, or other sites such as GOG, due to the large amount of data from constant updates to fix bugs discovered by the community.[44] On March 29, the beta was made available to Steam users,[45] and ran for slightly longer than planned due to issues with the new wheel system and joints between parts.[46]

Other Updates and Partnerships

On January 27, 2014, it was revealed that Squad is working on an education-themed version entitled KerbalEdu in collaboration with TeacherGaming LLC, creators of MinecraftEdu. It will include an improved user interface for easier data gathering and summary, pre-made lessons that focus on certain constructions, options to use the metric system, and a "robust pedagogy" that includes information outside of the game that ties into its content.[47][48]

Squad has also made an Asteroid Mission Pack, with full support from NASA. Released on April 1, 2014, it is based on the real-life initiative to send humans out to study asteroids.[15][49]

The majority of the game's music was provided by royalty-free composer Kevin MacLeod, with the rest of the soundtrack having been written by Squad in-house composer Victor Machado. The game's main theme was composed by lead designer Felipe Falanghe, and arranged by Machado.[50]

On June 5, 2015, it was announced that KSP was being ported to the PlayStation 4 by Flying Tiger Entertainment.[51][52] In August 2015, it was announced that Xbox One and Wii U ports were also in development by Flying Tiger Entertainment.[53][54]

Reception

Reception
Aggregate scores
AggregatorScore
GameRankings89%[55]
Metacritic88/100[56]
Review scores
PublicationScore
Destructoid8.5/10[57]
EurogamerEssential[58]
Game Informer8.5/10[59]
GameSpot9/10[60]
IGN9/10[61]
PC Gamer (UK)96/100[62]
Rock, Paper, ShotgunRecommended[63]
Awards
PublicationAward
GDCAudience Award Winner[64]
2015 Unity AwardsBest Gameplay winner[65]
2015 Unity AwardsCommunity Choice winner[66]
2015 Golden Joystick AwardsBest Indie Game[67]

Commercial

In the hours after its Steam early access release on March 20, 2013, KSP was one of the top 5 best sold games,[68] as well as the best seller on Steam for Linux.[69] Squad have also released many non-digital products such as clothing and plush toys.[70] In March 2015, Squad and 3D printing service Eucl3d announced a partnership that would allow players to order physical 3D printed models of their craft.[71]

Press

The public alpha and beta releases were well received. Many publications and individual people have referred fondly to Kerbal Space Program and praised the game's replayability and creative aspects, including Kotaku,[72] Rock, Paper, Shotgun,[73][74] IGN,[75] PC Gamer,[76] GameSpy,[77] Eurogamer,[14] Polygon,[26] Destructoid,[78] and The Torch.[79]

In May 2015, PC Gamer awarded Kerbal Space Program 1.0 a score of 96 out of 100, their highest review score of 2015.[80] They praised the "perfect blend of science and slapstick" as well as the sense of accomplishment that came from reaching other planets and completing goals.[62]

Scientific community

The game has notably crossed over into the scientific community with scientists and members of the space industry displaying an interest in the game – including NASA,[81] SpaceX's Elon Musk,[82] and ESA.[83] Squad has added a NASA-based Asteroid Redirect Mission pack to the game, allowing players to track and capture asteroids for mining and study.[49] Squad has also developed an official mod for the game centered around observing and tracking threatening asteroids, named Asteroid Day. The mod was developed in partnership with the B612 Foundation.[11] Some parts from this mod (though not the core functionality) were added as part of the release of the 1.1 update.[24]

See also

References

  1. 1 2 3 https://kerbalspaceprogram.com/about.php
  2. ↑ Phillips, Tom (April 21, 2015). "Kerbal Space Program is finally getting a v1.0 launch". Eurogamer. Retrieved April 21, 2015.
  3. 1 2 "First Release is Up!". Kerbal Space Program Blog. Squad. June 24, 2011. Retrieved April 27, 2015.
  4. 1 2 "Version history". Kerbal Space Program Wiki. Squad. June 24, 2011. Retrieved April 27, 2015.
  5. ↑ Villapaz, Luke (April 2, 2014). "'Kerbal Space Program' Launches NASA 'Asteroid Redirect Mission' Update". International Business Times. Retrieved May 1, 2014.
  6. ↑ Relaxnews (June 17, 2013). "PC Download Charts". xin.msn. Archived from the original on December 22, 2013. Retrieved July 22, 2014.
  7. ↑ Rossignol, Jim (December 18, 2012). "Trajectory: Squad Explain Kerbal Space Program". Rock, Paper, Shotgun. Retrieved May 2, 2014.
  8. 1 2 "KSP 1.0 is Released!". Kerbal Space Program Forums. Retrieved 2016-04-27.
  9. 1 2 "KSP 1.0.5 is live!". Kerbal Space Program Forums. Retrieved 2016-04-27.
  10. ↑ Groen, Andrew (June 18, 2013). "NASA’s Jet Propulsion Lab is obsessed with a certain game, and I bet you can guess what it is". The PA Report. Archived from the original on December 27, 2013. Retrieved June 19, 2013.
  11. 1 2 "Overview - Asteroid Day - Mods - Projects - Kerbal CurseForge". kerbal.curseforge.com. Retrieved 2016-04-27.
  12. ↑ "ElonMuskOfficial comments on I am Elon Musk, CEO/CTO of a rocket company, AMA!". Reddit. January 6, 2015. Retrieved March 26, 2015.
  13. ↑ Zuev, Artyom (July 31, 2013). "Environment art and modeling in Kerbal Space Program". Gama Sutra. Retrieved May 2, 2014.
  14. 1 2 Whitehead, Dan (January 31, 2014). "Kerbal Space Program Early Access Review". Eurogamer. Retrieved April 25, 2014.
  15. 1 2 Fingas, Jon (April 2, 2014). "NASA's game collaboration lets you steer asteroids without leaving home". Engadget. Retrieved April 25, 2014.
  16. ↑ "Challenges & Mission ideas - Kerbal Space Program Forums". Kerbal Space Program Forums. Retrieved 2016-04-28.
  17. 1 2 Pearson, Craig (May 24, 2013). "(Not) Rocket Science In Kerbal Space Program". Rock, Paper, Shotgun. Retrieved June 19, 2013.
  18. ↑ Russin, Aaron (May 1, 2013). "Kerbal Space Program raises metaphysical questions of purpose". Spectator Tribune. Retrieved May 2, 2014.
  19. 1 2 3 Devore, Jordan (October 17, 2013). "Kerbal Space Program Finally Gets Career Mode". Destructoid. Retrieved April 26, 2014.
  20. ↑ Gilson, Adam (March 30, 2014). "Kerbal Space Program — Review". Retrieved April 26, 2014.
  21. ↑ Nealie, Cam (February 10, 2014). "Kerbal Space Program review". 3news. Retrieved April 26, 2014.
  22. ↑ Groen, Andrew (October 17, 2013). "Kerbal Space Program is finally an actual game and it’s magnificent". The PA Report. Archived from the original on December 29, 2013. Retrieved May 1, 2014.
  23. ↑ "Kerbal Space Program: First Contract - The FAQ". Kerbal Space Program Forums. Retrieved 2016-04-27.
  24. 1 2 "Kerbal Space Program update 1.1 "Turbo Charged" is now available!". Kerbal Space Program Forums. Retrieved 2016-04-27.
  25. ↑ Emanuelli, Matteo (August 12, 2013). "Kerbal Space Program, the Spaceflight Simulator That Conquered JPL". Space Safety Magazine. Retrieved May 2, 2013.
  26. 1 2 Hall, Charlie (January 27, 2014). "To the Mun and Back: Kerbal Space Program". Polygon. Retrieved April 25, 2014.
  27. ↑ McRed, Targie (February 13, 2013). "Kerbal Space Program: Q&A with the devs". The Mittani. Retrieved May 2, 2014.
  28. 1 2 Hall, Charlie (2014-01-27). "To the Mun and back: Kerbal Space Program". Polygon. Retrieved 2016-04-28.
  29. ↑ "Known Griefers: Kerbal Space Program Devs Interviewed!". www.knowngriefers.com. Retrieved 2016-04-28.
  30. ↑ "One Year of KSP!". Kerbal Space Dev. Retrieved 2016-04-28.
  31. 1 2 "First Release is Up!". Kerbal Space Dev. Retrieved 2016-04-28.
  32. ↑ "Milestone: 5000 downloads and counting!". Kerbal Space Dev. Retrieved 2016-04-28.
  33. ↑ "Space Age: Kerbal Space Program Is Turning 0.22". Rock Paper Shotgun. Retrieved 2016-04-29.
  34. ↑ "KSP 0.22 Is Released!". Kerbal Space Program Forums. Retrieved 2016-04-29.
  35. ↑ "Kerbal Space Program: First Contract hands-on: career mode gets missions". pcgamer. Retrieved 2016-04-29.
  36. ↑ "Kerbal Space Program launches First Contract update, adding new missions and 64-bit support". pcgamer. Retrieved 2016-04-29.
  37. ↑ "Kerbal Space Program releases Economic Boom update". pcgamer. Retrieved 2016-04-29.
  38. ↑ "Steam Community :: Group Announcements :: Kerbal Space Program". steamcommunity.com. Retrieved 2016-04-29.
  39. ↑ "Kerbal Space Program beta update released". pcgamer. Retrieved 2016-04-29.
  40. ↑ "KSP has gone Beta! v0.90.0 is Officially Released!". Kerbal Space Program Forums. Retrieved 2016-04-29.
  41. ↑ "Kerbal Space Program Is Seven Days Away From Launch". Rock Paper Shotgun. Retrieved 2016-04-29.
  42. ↑ "KSP 1.0 is Released!". Kerbal Space Program Forums. Retrieved 2016-04-29.
  43. ↑ "Kerbal Space Program Launches Patch 1.1". Rock Paper Shotgun. Retrieved 2016-04-29.
  44. ↑ Ted. "Opt-in Prerelease for 1.1!". Retrieved March 30, 2016.
  45. ↑ KasperVld. "General Information". Retrieved March 30, 2016.
  46. ↑ "Devnote Tuesday: Moving Forward, Moving On". Kerbal Space Program Forums. Retrieved 2016-04-27.
  47. ↑ Matulef, Jeffrey (January 27, 2014). "Kerbal Space Program lands on various schools' curriculum". Eurogamer. Gamer Network. Retrieved January 28, 2014.
  48. ↑ Warr, Philippa (January 24, 2014). "Kerbal Space Program to get children as well as Kerbals into space". Wired. Retrieved April 25, 2014.
  49. 1 2 Sarkar, Samit (April 1, 2014). "Kerbal Space Program's Asteroid Redirect Mission now available". Polygon. Retrieved April 25, 2014.
  50. ↑ "Kerbal Space Program — Credits". IGDB.com. Retrieved May 19, 2015.
  51. ↑ "Devnote Tuesday: A big announcement". Kerbal Space Program Blog. Squad. June 17, 2015. Retrieved June 27, 2015.
  52. ↑ "Kerbal Space Program is coming to PlayStation 4. What does that mean for you?". Kerbal Space Program Forum. Squad. June 17, 2015. Retrieved June 27, 2015.
  53. ↑ "Kerbal Space Program is coming to Xbox One!". Kerbal Space Program Forums. Squad. August 20, 2015. Retrieved August 20, 2015.
  54. 1 2 Phillips, Tom. "Kerbal Space Program set to land on Wii U". Euro Gamer. Retrieved August 28, 2015.
  55. ↑ "Kerbal Space Program for PC". GameRankings. Retrieved June 27, 2015.
  56. ↑ Kerbal Space Program at Metacritic
  57. ↑ Devore, Jordan (May 5, 2015). "Review: Kerbal Space Program". Destructoid. Retrieved July 7, 2015. Science doesn't screw around
  58. ↑ Cobbett, Richard (May 7, 2015). "Kerbal Space Program review". Eurogamer. Retrieved June 27, 2015. An essential sandbox for anyone with an interest in space, rocketry, or explosions.
  59. ↑ Tack, Daniel (May 4, 2015). "Kerbal Space Program — It's Not Easy Being Green". Game Informer. Retrieved June 27, 2015.
  60. ↑ Clark, Justin (May 8, 2015). "Kerbal Space Program Review". GameSpot. Retrieved June 27, 2015.
  61. ↑ Macy, Seth G. (May 14, 2015). "Kerbal Space Program Review". IGN. Retrieved June 27, 2015. Kerbal Space Program is a deep, funny, and detailed physics sim that never takes itself too seriously.
  62. 1 2 Savage, Phil (May 1, 2015). "Kerbal Space Program review". PC Gamer. Retrieved June 27, 2015. A perfect blend of science and slapstick, and a robust and compelling sandbox of possibility. Simply outstanding.
  63. ↑ Caldwell, Brendan (May 13, 2015). "Kerbal Space Program review". Rock, Paper, Shotgun. Retrieved June 27, 2015.
  64. ↑ "14th Annual Game Developers Choice Awards". Game Developers Choice Awards. Game Developers Conference (UBM). March 2014. Retrieved July 7, 2015.
  65. ↑ "2015 Unity Awards". Unity (game engine). September 2015. Retrieved September 30, 2015.
  66. ↑ "2015 Unity Awards". Unity (game engine). September 2015. Retrieved September 30, 2015.
  67. ↑ "2015 Golden Joystick Awards". October 2015. Retrieved October 30, 2015.
  68. ↑ Relaxnews (June 17, 2013). "PC Download Charts". xin.msn. Archived from the original on December 22, 2013. Retrieved July 22, 2014.
  69. ↑ Stahie, Silviu (April 1, 2013). "Kerbal Space Program Is the Best-Selling Game on Steam for Linux". softpedia. Retrieved June 18, 2013.
  70. ↑ "KSP - Jeb Plushie & T-shirt". makershop.com. Retrieved January 7, 2016.
  71. ↑ "Weâ€â"¢re Eucl3D (the 3D printing guys). Weâ€â"¢ve added mod support and have lower prices!". Kerbal Space Program Forums. Retrieved 2016-04-27.
  72. ↑ Plunkett, Luke (July 18, 2011). "Will You Help These Stupid Aliens Into Space?". Kotaku.com. Retrieved August 18, 2013.
  73. ↑ Pearson, Craig (May 24, 2013). "(Not) Rocket Science In Kerbal Space Program". Rock, Paper, Shotgun. Retrieved June 19, 2013.
  74. ↑ Rossignol, Jim (July 12, 2011). "Trans-Lunar: Kerbal Space Program". Rock, Paper, Shotgun. Retrieved August 18, 2013.
  75. ↑ Gallegos, Anthony (April 21, 2012). "Five Ridiculous Upcoming Games". IGN. Retrieved November 12, 2012.
  76. ↑ "Kerbal Space Program". PC Gamer. Retrieved June 29, 2013.
  77. ↑ Nelson, Mike (March 29, 2012). "Become a Terribly Awesome Rocket Scientist With Kerbal Space Program". GameSpy. Retrieved June 19, 2013.
  78. ↑ Lyons, Sterling (February 5, 2012). "Revisiting the Kerbal Space Program". Destructoid. Retrieved April 26, 2014.
  79. ↑ Hooper, Tom (January 31, 2013). "Kerbal Space Program (Beta) , SQUAD (P)review". The Torch. Retrieved June 19, 2013.
  80. ↑ Davenport, James (December 31, 2015). "Our Highest Review Scores of 2015". PC Gamer. Retrieved March 30, 2016.
  81. ↑ Groen, Andrew (June 18, 2013). "NASA’s Jet Propulsion Lab is obsessed with a certain game, and I bet you can guess what it is". The PA Report. Archived from the original on December 27, 2013. Retrieved June 19, 2013.
  82. ↑ Boyle, Alan (January 6, 2015). "Coming Soon From SpaceX's Elon Musk: How to Move to Mars". NBC News. Retrieved February 24, 2015.
  83. ↑ "Kerbal Space Program: Beta Than Ever is Now Available". Kerbal Space Program Blog. Squad. December 15, 2014. Retrieved December 23, 2014.

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