Witness the fallout of the Resonance Cascade as Dr. Gina Cross and Dr. Colette Green fight to stabilize Black Mesa.

This immersive no-commentary gameplay walkthrough follows Cross and Green’s critical mission in the aftermath of Gordon Freeman’s disastrous experiment. After the interdimensional portal accident triggers the Resonance Cascade, the duo must navigate Black Mesa's crumbling facility, combat hostile aliens and HECU soldiers, and assist Dr. Richard Keller and Dr. Rosenberg in a desperate bid to contain the catastrophe.

Key chapters include escorting Rosenberg to the surface for a military distress signal, reactivating dampening fields, and preparing a satellite launch to counteract the escalating dimensional rift. They also face intense battles in the Gamma Labs to raise a prototype displacement beacon essential for sealing the rift.

The story climaxes in a chaotic defense of the beacon against waves of Xen attackers, with a dramatic "harmonic reflux" moment connecting to Half-Life: Blue Shift. In the bonus chapter, Xen Attacks, play as two Vortigaunts recovering crystals vital to the Nihilanth’s survival.

This full game longplay delivers crisp 1080p 60fps gameplay, offering an uninterrupted playthrough of this pivotal Half-Life expansion.

TITLE: Half-Life: Decay
GENRE: Action
DEVELOPER: Gearbox Software
PUBLISHER: Sierra On-Line
FRANCHISE: Half-Life
RELEASE DATE: 14 Nov, 2001

CHAPTERS:

1) Dual Access 0:00
2) Hazardous Course 8:54
3) Surface Call 17:06
4) Resonance 26:46
5) Domestic Violence 38:30
6) Code Green 49:20
7) Crossfire 59:04
8) Intensity 01:09:10
9) Rift 01:18:02
10) (Bonus Chapter) Xen Attacks 01:31:57

Enjoy this Half-Life: Decay full game video!

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Each longplay and playthrough is crafted to be more than just entertainment—use them as comprehensive guides to overcome challenges, uncover secrets, and experience every detail. Every video is produced personally to guarantee an uninterrupted, authentic experience from start to finish.

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This video, titled HALF-LIFE: DECAY Gameplay Walkthrough FULL GAME [No Commentary Longplay], was created in full compliance with Valve's Video Policy (link below). If any issues arise, please contact me via the email provided under 'channel details' on my homepage. Thank you.

Valve’s Video Policy: [ Ссылка ]

NOTICE:

This video is made on the ‘official’ pc port of the Half-Life add-on on ‘Decay’, which originally released only on the PlayStation 2. I’ve left a link below to a video on the latest Half-Life: Decay news, where you can download this mod (you must already own Half-Life), and how you can unlock the hidden bonus chapter ‘Xen Attacks’

Half-Life: Decay is Back! - 25 Year Anniversary Update - [ Ссылка ]
Half-Life: Decay Mod Site - [ Ссылка ]
How To Unlock ‘Xen Attacks’ (Bonus Chapter) - [ Ссылка ]

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