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Delta Particles 2021
Delta Particles is a first-person shooter video game mod for Half-Life, developed by Russian creator Yuri "XF-Alien" Epifantsev. Originally titled Half-Life: Delta, it was released on October 29, 2021, after being in development for twelve years, starting in August 2009. The mod features a single-player experience and is set at the Delta Base, where protagonist Nick Farrell encounters effects from the resonance cascade at the Black Mesa Research Facility. It includes four chapters and 35 maps. Epifantsev called this project their "largest and oldest," and expressed satisfaction in completing it. The mod was later released on Steam in December 2024.
Details
- Developer
- Yuri "XF-Alien" Epifantsev
- Modes
- Single-player
- Engine
- GoldSrc
- Series
- Half-Life




