Uploaded January 2013 | Updated September 2026, 2 weeks ago
Included in Half-Life Alpha v 0.52 are 15 working dem files recorded by someone at Valve (perhaps Gabe himself?) showcasing almost all of the available singleplayer levels. This video is a montage of every demo.
Note: You'll likely notice that most of the model animations appear to be quite choppy. This is a visual artifact caused by the demo playback, probably because these demos were recorded on an older version of the engine. However, these demos provide unique insight into a number of features that don't work in the current build of the alpha, namely the fully functioning Human Sergeant enemy (5:23, 7:50) aka monster_human_assault aka the "YOU DEAD! YOU HEAR ME? DEAD!" guy with the minigun.
Note 2: This video was recorded in the software renderer which possesses a number of additional working HUD elements and particle effects that don't display in the hardware accelerated renderer.
c1a1.dem: 0:00
c1a2a.dem: 2:30
c1a2b.dem: 7:33
c1a2c.dem: 11:09
c1a3.dem: 12:26
c1a3a.dem: 13:56
c1a3b.dem: 16:56
c1a3c.dem: 18:50
c2a4.dem: 19:44
c2a4a.dem: 20:08
c2a4b.dem: 23:18
c2a4c.dem: 28:29
c3a1.dem (communications center): 30:53
c3a2.dem (xlab1 - energy): 35:38
c3a2a.dem (xlab1 - energy): 37:37
Included in Half-Life Alpha v 0.52 are 15 working dem files recorded by someone at Valve (perhaps Gabe himself?) showcasing almost all of the available singleplayer levels. This video is a montage of every demo.
Note: You'll likely notice that most of the model animations appear to be quite choppy. This is a visual artifact caused by the demo playback, probably because these demos were recorded on an older version of the engine. However, these demos provide unique insight into a number of features that don't work in the current build of the alpha, namely the fully functioning Human Sergeant enemy (5:23, 7:50) aka monster_human_assault aka the "YOU DEAD! YOU HEAR ME? DEAD!" guy with the minigun.
Note 2: This video was recorded in the software renderer which possesses a number of additional working HUD elements and particle effects that don't display in the hardware accelerated renderer.
c1a1.dem: 0:00
c1a2a.dem: 2:30
c1a2b.dem: 7:33
c1a2c.dem: 11:09
c1a3.dem: 12:26
c1a3a.dem: 13:56
c1a3b.dem: 16:56
c1a3c.dem: 18:50
c2a4.dem: 19:44
c2a4a.dem: 20:08
c2a4b.dem: 23:18
c2a4c.dem: 28:29
c3a1.dem (communications center): 30:53
c3a2.dem (xlab1 - energy): 35:38
c3a2a.dem (xlab1 - energy): 37:37
