The Citadel also looked very different, it was more round than the bulky Citadel from the final version.

Originally, Eli and Alyx Vance had no relation, and Eli’s lab was originally intended to resemble a form of scrapyard and town in a cave than a better equipped laboratory within a hydroelectric power station the scrapyard area where the Gravity Gun tutorial takes place resembles the original concept being an auxiliary area as opposed to the bulk of the lab. Parts of the book detail how Gordon would fight alongside characters such as Odessa Cubbage, albeit under a different name and in a different place, as well as fighting together with Colonel Vance – a character that was later merged with Eli to become Doctor Eli Vance – and Vance’s forces. The game was originally intended to be much more diverse in settings (to the extent that the game felt almost overblown, and little time being spent on developing existing characters one of the key reasons for it being cut). The Cremator’s head would eventually be featured in Eli’s lab in Black Mesa East, encased in a jar of formaldehyde, which Eli will make comments about when the player nears the jar and views it.

There was also a planned creature called the Cremator who would clean the streets of bodies after a skirmish with a massive acid gun called an Immolator, which would double as an offensive weapon when the Cremator would become an enemy. Other enemies cut from the game included Combine assassins (their AI was salvaged to form the Fast Zombie they were females, very similar in attitude to the Half-Life black ops they are included in Half-Life 2: Survivor), a newly skinned bullsquid, houndeyes, various Synths and Combine soldiers.

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