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Near the end of Doom 3, before the player faces the Cyberdemon, turning left will bring the player to a brick with the id Software logo printed on it. Interracting with this brick opens up a secret room containing a PDA from id Software themselves. The PDA contains messages from the id Software staff, thanking the player for playing through to the end of the game.
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The first Hell Knight's appearance was in Delta Labs 4. The portal to hell activates, and two Hell Knights emerge. They have noticeably more health than the regular Hell Knights fought later in the game, making them almost a boss encounter, reminiscent of the first bosses in the original Doom where the player must defeat a pair of Barons of Hell at the end of Knee-Deep in the Dead.
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In the chapter "Site 3", one of the stone tablets represents the cover of the original Doom.
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In Resurrection of Evil, the playable arcade game "Martian Buddy Blaster" features the player-sprite of the BFG9000 from previous Doom titles.
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In the PC version of the game, should the player attempt to input any of the original Doom or Doom II classic cheat codes (IDDQD, IDKFA etc.) into the game's console, the console will print out a message saying "Your memory serves you well!" This otherwise has no beneficial effect for the player.
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Throughout the game, there are arcade cabinets which the player can interact with. The game is called "Super Turbo Turkey Puncher 3". This game has players to punch a turkey until it is gibbed, the graphics in the game are taken from the first 2 Doom games including the fist sprites and the background being a door from E4M9 "Fear", the fourth secret level of Doom. The title graphic is a parody of Street Fighter Alpha 3 and the company responsible for the game is "Nabcon", being a parody of Capcom.
Getting a high score on this game results in the player getting a congratulatory email which also informs the protagonist that his vacation has been docked two days for time-wasting.
Getting a high score on this game results in the player getting a congratulatory email which also informs the protagonist that his vacation has been docked two days for time-wasting.
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In 2002, the alpha version of Doom 3 had been leaked online. In this alpha version, the logo used for Doom 3 looked markedly different from its final version, using stylized roman numerals like one of its predecessors Doom II: Hell on Earth.
The Inquirer article:
https://web.archive.org/web/20021106093537/http://www.theinquirer.net/?article=6050
Doom Wiki article:
https://doomwiki.org/wiki/Doom_3_alpha_version
E3 2002 footage (banner and demo booth seen in the first few seconds):
https://www.youtube.com/watch?v=vxMWIb34Yjo
https://web.archive.org/web/20021106093537/http://www.theinquirer.net/?article=6050
Doom Wiki article:
https://doomwiki.org/wiki/Doom_3_alpha_version
E3 2002 footage (banner and demo booth seen in the first few seconds):
https://www.youtube.com/watch?v=vxMWIb34Yjo
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