Hallucination "biohazard 4" (幻の「バイオハザード4」 Maboroshi no "biohazard 4"?) is the term given to the second stage in the Resident Evil 4 development cycle, succeeding "Castle".[1]


"Hookman was merely an experiment and there was no true back-story. I wanted to make biohazard 4 scarier and suggested using a particular scene from the film "The Lost Souls", where the main character (played by Winona Ryder), while washing her hands in a bathroom, suddenly finds herself in a derelict building with a killer on the loose. An arranged version of this idea eventually turned into Hookman."
Yasuhisa Kawamura [2]

There is not much known about the plot in this version, it is presumed that the developers commented and stated that this version was merely a test using previous assets from the Castle version and new gameplay ideas the writer and producer wanted to experiment with, the main test map of this build is composed of a few rooms only with no entrance or exit.



During E3 2003, both a demo and trailer were made for Resident Evil 4, which had reached its "Hallucination" stage of development. The game displayed numerous elements that were carried over to the final release:

  • The over-the-shoulder perspective when Leon's weapon is drawn.[1] However, in the video, there are a few times when Leon aims without the over-the-shoulder camera. The game reverts to a third-person view like a traditional Resident Evil game.
  • A red laser sight for Leon to use while aiming.
  • Leon being infected.
  • The flashlight that is added to Leon's character design.
  • A suit of armor suddenly attacking Leon when he attempts to pass it, as well as the button combination to dodge the attack.
  • The button option to throw a grenade.
  • The concept of assigning the L button to draw another type of weapon. In the beta version, the weapon was a grenade; in early final trials it is removed, in the final release, the weapon was a knife.
  • The 'struggle' feature where player has to break free from an enemy's grasp.
  • Leon's health indicator. It flashes when Leon is hurt, but in the final release the developers decided to add a HUD to display more information.


First shown at E3 in 2003, this version was set in a mansion and featured Leon fighting what appeared to be paranormal enemies, such as medieval suits of armor and living dolls. Still infected with a virus as in "Castle", the screen would adopt a blue filter once the paranormal entities appeared as part of hallucinations.[3] The most notable enemy in this version was the "Hook Man", a ghost-looking man carrying a large hook.[1][3]

This version was reportedly so scary that Shinji Mikami warned the gamers with an infamous quote "Don't pee your pants" prior showing the initial trailer at E3.[1] Gameplay footage of this version was featured in the Biohazard 4 Secret DVD.[4] Ultimately, "Castle" and "Hallucination" were scrapped due to technical limitations which would cost too much to resolve.





  1. 1.0 1.1 1.2 1.3 Travis Fahs (March 11, 2009). IGN Presents the History of Resident Evil. IGN. Retrieved on July 17, 2010.
  2. Yasuhisa Kawamura Interview (Project Umbrella). Project Umbrella. Retrieved on 2013-06-24.
  3. 3.0 3.1 Heidi Kemps (September 27, 2004). Hiroyuki Kobayashi on Resident Evil 4 & Killer 7. GameSpy. Retrieved on July 18, 2010.
  4. Juan Castro (January 26, 2005). RE4 Bonus Disc Footage. IGN. Retrieved on July 18, 2010.