A huge "thank you," as always, to John Romero. John has always been willing to give me as much time as I need to ask all of my questions, and never fails to give detailed answers and tell fantastic stories. Thank you also to Limited Run Games co-founder Doug Bogart and Doom community member "dew" for agreeing to interviews that offered a look at Sigil's development through two additional lenses. Last but not least, thank you to Shacknews CEO and editor-in-chief Asif Khan for editing assistance, and for his steadfast support of and belief in long-form content.
Notes and Citations
raked in over $100,000 a day for id: "'Doom' Turns 20: We Take A Look At The Game's History," International Business Times, https://www.ibtimes.com/doom-turns-20-we-take-look-games-history-1505336.
only accounted for $9 shareware purchases: Ibid.
return to fast, violent and masterful play: "BLACKROOM: A New FPS from Romero & Carmack," Kickstarter, https://www.kickstarter.com/projects/nightworkgames/blackroom-a-new-fps-from-romero-and-carmack/description.
the kind of gameplay, look and innovative: Ibid.
Mockingbird Software beat Romero to the punch: "REKKR: Doom mod," ModDB.com, https://www.moddb.com/mods/rekkr.
An overview of REKKR posted on: "REKKR V1.16," Doom World, https://www.doomworld.com/forum/topic/90862-rekkr-v115/.
originally a mold of William Shatner’s Captain Kirk: "Was Michael Myers' Halloween Mask William Shatner's Face?", StarTrek.com, http://www.startrek.com/article/was-michael-myers-halloween-mask-william-shatners-face.