Elaborating in what I said earlier. In DOOM Eternal in the Doom Slayer's Fortress of Doom, there is a book case with lots of books with wordplays on Doom, Slayer, Argenta, Rip and Tear, etc. I am not counting that because they are obviously references to books, but it doesn't imply anything about the universe those books take place.
However, there are numerous books that seem to reference in-universe things from different games, mostly FPS. So maybe the Doom Slayer has traveled to those universes? Even if only just to grab a book
There are 2 books that I would not count and are:
-"Why I'm So Great Pt. II" by Dork Norkem - Seems to be the second part to "Why I'm So Great" by Duke Nukem, but as you can see it is written by "Dork Norkem" instead of Duke Nukem.
-"RET-CONNED: The Life and Times of Flynn Taggart" - Makes reference to "Flynn Taggart, the canonical name of the Doom Guy in the old Doom novels. However these novels can't be canon, since they show a backstory and an adaptation of the plot of Doom I/II incompatible with the rest of things, were there is no Hell and demons are zombified humans, like in the first Doom movie. Also usually is accepted that the Doom Guy is just B.J. Blazcowicz III, descendant of Wolfenstein's B.J. Blazcowicz, not "Flynn Taggart".("FLYNNTAGGART" is also the password that unlocks DOOM II in the Doom Slayer's computer, but I am going to guess that is just a reference, since the canonical existence of Doom and Doom II as video games in the Doom universe raises a few questions).
The rest of the books perfectly sound as something the Doom Slayer could have gotten if he traveled to alternate universes in a short of FPS Mega/Multiverse:
-"My Buddy Superfly" by Hiro Miyamoto - Written by Daikatana main character
-"Devilish Daggers & Other Assorted Pointy Objects" - Devil Daggers is a retro indie shooter inspired by Doom
-"LIANDRI - A Brief History of Interplanetary Industry" - The tournment in Unreal Tournament is organized by the Liandri Mining Corporation.
-"Von Braun - Onboard AI System Technical Manual:" The Von Braun is the spaceship in which System Shock 2 starts.
-"Mesa Science Monthly - Predicting Unforeseen Consequences" - It would be more direct if it was "Black Mesa Monthly" but you get the reference.
-"U-NAT-CO Training Manual: Bomb Defusal" - The UNATCO (But without the "-"s is the organization the Deux Ex main character starts working.
-"The Spear of Destiny: A Post-War Deconstruction" - Reference to Spear of Destiny
-"Living With Rage - and Other Common Emotions in the Apocalyptic Wasteland" - Reference to Rage
-"THE STROGG: A Transdimensional Field Study" - The Strong are the villains of Quake II/4
-"From Nopefish to Dopefish: The Dope Tale" - Reference to Commander Keen
-"Tei Tenga - Offworld Travel Guide" - Reference to the initial setting of Doom during development
-"Cooking from Hell's Kitchen - Thy Flesh Consumed" - Reference to DOOM itself.
-"2 Prey or Not 2 Prey" - Reference to Prey (2006) and it's delayed sequel that eventually transformed into Prey (2017)
-"Vault Dweller's Survival Guide - Preparing Yourself and Your Loved Ones For the Inevitable Nuclear Apocalypse", "Nuka-Cola - A History from the Atomic Age of Flavor" and "Mr. Fuzzy and Teddy Fear" - References to the Fallout Universe
There is also an skateboard in reference to Tony Hawk's Pro Skater 3 were he was an unlockable character, but it is not his board from that game it seems. It would be cool if he would have been in the Tony Hawk's Pro Skater Universe, since that universe could actually be Marvel's Earth-20824, not only for Spider-Man's appearance in THPS 2, but because that cameo is reference back in the Spider-Man games: In the PS1's Spider-Man video game there are billboards of THPS2 and when approached Spidey says "Tony Hawk! Hey, I skated with that guy!"
However, there are numerous books that seem to reference in-universe things from different games, mostly FPS. So maybe the Doom Slayer has traveled to those universes? Even if only just to grab a book
There are 2 books that I would not count and are:
-"Why I'm So Great Pt. II" by Dork Norkem - Seems to be the second part to "Why I'm So Great" by Duke Nukem, but as you can see it is written by "Dork Norkem" instead of Duke Nukem.
-"RET-CONNED: The Life and Times of Flynn Taggart" - Makes reference to "Flynn Taggart, the canonical name of the Doom Guy in the old Doom novels. However these novels can't be canon, since they show a backstory and an adaptation of the plot of Doom I/II incompatible with the rest of things, were there is no Hell and demons are zombified humans, like in the first Doom movie. Also usually is accepted that the Doom Guy is just B.J. Blazcowicz III, descendant of Wolfenstein's B.J. Blazcowicz, not "Flynn Taggart".("FLYNNTAGGART" is also the password that unlocks DOOM II in the Doom Slayer's computer, but I am going to guess that is just a reference, since the canonical existence of Doom and Doom II as video games in the Doom universe raises a few questions).
The rest of the books perfectly sound as something the Doom Slayer could have gotten if he traveled to alternate universes in a short of FPS Mega/Multiverse:
-"My Buddy Superfly" by Hiro Miyamoto - Written by Daikatana main character
-"Devilish Daggers & Other Assorted Pointy Objects" - Devil Daggers is a retro indie shooter inspired by Doom
-"LIANDRI - A Brief History of Interplanetary Industry" - The tournment in Unreal Tournament is organized by the Liandri Mining Corporation.
-"Von Braun - Onboard AI System Technical Manual:" The Von Braun is the spaceship in which System Shock 2 starts.
-"Mesa Science Monthly - Predicting Unforeseen Consequences" - It would be more direct if it was "Black Mesa Monthly" but you get the reference.
-"U-NAT-CO Training Manual: Bomb Defusal" - The UNATCO (But without the "-"s is the organization the Deux Ex main character starts working.
-"The Spear of Destiny: A Post-War Deconstruction" - Reference to Spear of Destiny
-"Living With Rage - and Other Common Emotions in the Apocalyptic Wasteland" - Reference to Rage
-"THE STROGG: A Transdimensional Field Study" - The Strong are the villains of Quake II/4
-"From Nopefish to Dopefish: The Dope Tale" - Reference to Commander Keen
-"Tei Tenga - Offworld Travel Guide" - Reference to the initial setting of Doom during development
-"Cooking from Hell's Kitchen - Thy Flesh Consumed" - Reference to DOOM itself.
-"2 Prey or Not 2 Prey" - Reference to Prey (2006) and it's delayed sequel that eventually transformed into Prey (2017)
-"Vault Dweller's Survival Guide - Preparing Yourself and Your Loved Ones For the Inevitable Nuclear Apocalypse", "Nuka-Cola - A History from the Atomic Age of Flavor" and "Mr. Fuzzy and Teddy Fear" - References to the Fallout Universe
There is also an skateboard in reference to Tony Hawk's Pro Skater 3 were he was an unlockable character, but it is not his board from that game it seems. It would be cool if he would have been in the Tony Hawk's Pro Skater Universe, since that universe could actually be Marvel's Earth-20824, not only for Spider-Man's appearance in THPS 2, but because that cameo is reference back in the Spider-Man games: In the PS1's Spider-Man video game there are billboards of THPS2 and when approached Spidey says "Tony Hawk! Hey, I skated with that guy!"
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