Doom 3 - 2002 Prototype Gameplay
3,498Gameplay of the E3 2002 tech demo of Doom 3. Early prototype with cut content.
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Wikipedia: Id Software began development on Doom 3 in late 2000, immediately after finishing Quake III: Team Arena.[32] In 2001, it was first shown to the public at Macworld Conference & Expo at Makuhari Messe[33] and was later demonstrated at E3 2002 at LACC, where a fifteen-minute gameplay demo was shown. It won five awards at E3 that year.
Late in 2002, two employees at ATI Technologies leaked a development version of Doom 3 onto the Internet. One year later, a new trailer was shown at E3 2003 and soon afterwards id Software's website was updated to showcase Doom 3 as an upcoming project, although it was also announced that Doom 3 would not be ready for the 2003 holiday season. According to John Carmack, the development took longer than expected.
https://en.wikipedia.org/wiki/Doom_3#Production
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At present, NeoGamer - The Video Game Archive has 230,469 views spread across 5 videos for Doom 3, with approximately 1 hour of Doom 3 video on his channel. This is less than 0.17% of the total video content that NeoGamer - The Video Game Archive has uploaded to YouTube.