Editing Commander Keen (section)

==Legacy==
{{anchor|Dopefish}}{{Redirect|Dopefish|the DJ|Jean-Philippe Chainiaux}}
Ideas from the Deep's first royalty check from Apogee in January 1991 convinced them that they no longer needed their day jobs at Softdisk but could devote themselves full-time to their own ideas, leading to the founding of id Software in February.<ref name="MOD6676"/> In the summer of 1991, id hosted a seminar for game developers with the intention of licensing the ''Commander Keen'' [[game engine|engine]]; they did so, forming the spiritual predecessor to both [[QuakeCon]] and id's standard of licensing their game engines.<ref name="MOD85" /><ref name="Engine" />
[[File:Dopefish Commander Keen.png|thumb|right|The Dopefish, burping, as seen in the level in which it appears in "Secret of the Oracle"]]
One of the enemies created for "Secret of the Oracle", the Dopefish, has since the game's release become one of the [[video game industry]]'s biggest [[in-joke]]s,<ref name="injoke1"/><ref name="injoke2"/><ref name="dopefish4"/> making cameo appearances in other games.<ref name="dopefish4"/><ref name="dopefish2"/><ref name="dopefish3"/> The Dopefish, which Hall describes as "just a stupid green fish", is described in "Secret of the Oracle" as "the second-dumbest creature in the universe".<ref name="3DRretro"/> It has appeared in dozens of other games since its initial appearance, as references, images, or the phrase "Dopefish Lives".<ref name="dopefish"/>

{{anchor|Standard Galactic Alphabet|SGA}}
The Standard Galactic Alphabet, a [[writing system]] used to depict alien [[language]]s in the galaxy throughout the series, is used for textual signs and directions and was created by [[Tom Hall]] beginning with ''Invasion of the Vorticons'' as a way to pass hidden messages to players. It is a [[substitution cipher]] to the Latin alphabet, including the letters A–Z, opening and closing quotation marks, and a full stop. In 2019, it was added to the [[Under-ConScript Unicode Registry]], using the codepoints {{unichar|EB40|STANDARD GALACTIC LETTER A|image=SGA letter A.png|size=21px}} to {{unichar|EB5F|STANDARD GALACTIC FULL STOP|image=SGA fullstop.png|size=21px}}, and is included in the [[GNU Unifont]] CSUR extension.<ref name="UCSUR"/> The Standard Galactic Alphabet also appears in the game ''[[Minecraft]]'' as the script and symbols used for its Enchanting Table.<ref name="Minecraft"/>

[[File:Standard Galactic Alphabet transliteration (Commander Keen 6).png|thumb|Transliteration found in ''Aliens Ate My Babysitter''<br/>'''Top:''' Standard Galactic Alphabet [[artificial script]]<br/>'''Bottom:''' [[Latin alphabet|Latin script]]]]

In January 2018, John Romero and Tom Hall stated on Twitter that Billy Blaze is the grandson of ''[[Wolfenstein]]'' protagonist [[B.J. Blazkowicz|William "B.J." Blazkowicz]] and the father of [[Doomguy]] from ''[[Doom (1993 video game)|Doom]]''.<ref name="LineageTweet"/> Commander Keen himself has appeared or has been referenced in many other video games over the years, including ''[[Doom II: Hell on Earth|Doom II]]'', ''[[Duke Nukem]]'',  ''[[Bio Menace]]'' and ''[[Doom (2016 video game)|Doom]]'' (2016).<ref name="3DRretro"/>

A number of fan-made ''Commander Keen'' games have been created since the publication of the original titles, with a fan website, the Public Commander Keen Forum, devoted to their creation, announcement, and discussion.<ref name="PCKF"/> Since the release of utilities to modify the levels and graphics in the original ''Keen'' series in 2002, more than fifty [[mod (video gaming)|mods]] have been made, most of which feature Commander Keen as the protagonist. These mods include "Commander Genius", an [[Game engine recreation|engine]], released for multiple platforms, which interprets the episodes as a "retro-evolved" game, with re-polished graphics, a multiplayer compatibility, and a [[level editor]],<ref name="CG"/> ports and remakes on different platforms, and ''The Universe Is Toast!'' mod, an unofficial sequel trilogy of games.<ref name="TUIT"/>

In January 2013, Tom Hall began development of ''Worlds of Wander'', a tool for creating platform games, and the following month began a [[Kickstarter]] campaign for the tool and associated game, ''Secret Spaceship Club'', which he described as a spiritual successor to ''Commander Keen''. The project was unsuccessful in reaching its goal, though Hall said that he planned to continue working on it in his spare time.<ref name="SSC"/>