Delta Particles – is a total conversion mod for HL. You're playing as a technical engineer of complex "Delta Base" Nick Farrell. Unfortunately, the protagonist was in the wrong place at the wrong time, as an experiment at the Black Mesa Research Facility resulted in a resonance cascade.
Listed as free to play on Steam.
View country availability
Delta Particles v1.3 First of all, I would like to say "thank you!" to everyone who has added Delta Particles into their Steam Library. Because the mod has over 100,000 installations at this point! That's not such a bad result. You can proceed with your current walkthrough on the
Delta Particles is a total conversion mod for Half-Life and is finally available on Steam now! Thank you for being with me all this time! Join my Discord and YouTube channel!