These are games "featuring a reference either directly to the novel Fahrenheit 451 by Ray Bradbury, or as a reference to Looking Glass Studios, Inc.'s immersive sims and their spiritual successors." This list is an effort educate/inform other's of such a niche genre in 0451-style immersive games and games who pay tribute to the code big, small, even if its not an immersive sim. If you don't see multiple titles within a series. I'm using one game to represent them. Notes enclosed will add clarification when needed. Otherwise, no note included. I'll be updating this list as the years pass by. Suggestions welcome.

What is 0451?
If you've been playing a lot of Looking Glass and Ion Storm games you know that the code here is 0451, which is first used in System Shock. It showed up in Thief, it showed up in System Shock 2, it showed up in BioShock and Dishonored recently, and in both Deus Ex games. A lot of people think it was a reference to Fahrenheit 451, the Ray Bradbury book, but it was actually just the key code to get into the offices at Looking Glass in Cambridge. But it's in so many games now, it's kind of a defining thing in what we used to call 'immersive simulations.'
— Warren Spector, director of Deus Ex and producer of System Shock

Sources: Gaming, System Shock 2, TIL, Moby, Deus Ex, Steam 0451, Through The Looking Glass - Locations in every game, SuiMachine Blog - Pictures & Locations!, Giant Bomb, Errant Signal, Hit Self Destruct, Itch.io 451

Part of my Repository folder. A series of lists to inform/educate others on games within a niche not many people know including myself.