Free FPS on Half Life engine gets big update

A new update to the popular mod, Diffusion, is now available. Built on the original Half-Life, it was recognized as one of the best mods of 2025 by ModDB users, earning the second-place spot in their annual awards.

This single-player first-person shooter puts you in a new, futuristic world as an experienced SWAT officer who unexpectedly gets caught up in strange experiments. It’s built using the Half-Life engine, but features completely original content – all the maps, characters, enemies, and weapons are new. The gameplay has been updated and improved, blending classic shooting with modern tactical elements.

Even though this project started as a modification for the game Half-Life, it’s now a completely separate experience – effectively a free game you can play on its own.

The new version of the mod (1.1), brings many changes. The most important ones include:

  1. All voice acting has been replaced with new recordings of much higher quality.
  2. Graphical elements on many campaign maps have been improved.
  3. Enemy AI and weapon balance are now enhanced.
  4. Numerous bug fixes have also been implemented.

Last year, Diffusion really stood out as a delightful surprise. It’s a free game that’s surprisingly well-made – on par with many paid ‘boomer shooters’ you’ll find today. If you haven’t played it yet, it’s absolutely worth checking out.

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2026-02-01 22:02