Black Mesa is the fan-made reimagining of Valve Software’s Half-Life.
Black Mesa: Definitive Edition
Update 1.5 brings together all the improvements to graphics and gameplay across 15 years of development to create the final version of Black Mesa. There has never been a better time to pick up the crowbar and play!
Single Player Campaign
You are Gordon Freeman, a theoretical physicist at the Black Mesa Research Facility. When a routine experiment goes horribly wrong, you must fight your way through an interdimensional alien invasion, and a bloodthirsty military clean-up crew in order to save the science team... and the world!
Features
A completely reimagined and refined single player campaign, including all new and expanded Xen levels
19 chapters of fighting through top-secret labs, running atop harsh desert landscapes, sneaking into abandoned railways, and leaping across dimensions
Mind-Blowing graphics and effects, never before seen on the Source Engine
Face off against an army of classic enemies, updated with new features and engaging AI
Wield an arsenal of military hardware, scientific prototypes, and the iconic crowbar through incredibly detailed environments
The all-new soundtrack and voice acting create a more immersive experience than ever before
50 Fun and challenging achievements
Multiplayer
Frag your friends across 10 iconic maps from the Half-Life universe, including:
Bounce
Gasworks
Stalkyard
Undertow
Crossfire
Workshop
Create your own mods, models, and maps with the Black Mesa Source SDK, then share it with the community on the Steam Workshop.
Steamworks
Collect the full set of trading cards, backgrounds, emoticons, and achievements! Featuring Steam Cloud, Steam Workshop, closed captions in multiple languages and full controller support.
windows Minimum
OS: Windows® 10 or Newer
Processor: 2.6 Dual Core Processor or Greater
Memory: 6 GB RAM
Graphics: 2 GB Dedicated Video Card or Greater
Storage: 20 GB available space
Directx: Version 9.0c
Network: Broadband Internet connection
windows Recommended
OS: Windows® 10 or Newer
Processor: 3.2 Quad Core Processor or Greater
Memory: 8 GB RAM
Graphics: 4 GB Dedicated Video Card or Greater
Storage: 20 GB available space
Directx: Version 9.0c
Network: Broadband Internet connection
To activate the game, you need a Steam Account
Login or register at the official Steam Website and download Steam client
Install and start application, login with your Account name and Password
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process
After the successful code verification, go to the "MY GAMES" tab and start downloading.
News & Updates
2026-04-15
Complete Our Side Quest and Win
As you probably know, in a huge variety of game titles there are usually a lot of mainline task objectives, but very often there are multiple side quests that would advance you further in the gameplay. This is exactly why we decided to run a Side Quest promotion on our YUPLAY site. In order to participate in it you have to make an order over 20€ between 17.04.2026 18:10 CET and 20.04.2026 02:00 CET, and you will get a 1€ voucher for next purchase…
The Easter season is here and since we like this part of the year so much, we have made sure to have prepared a special YUPLAY promotional campaign for those of you that are ready to go into the Raid Party and grab a FREE gaming title. All you have to do is make an order above 20€ between 02.04.2026 15:00 CET and 08.04.2026 15:00 CET, and you will get a FREE game as ab Easter present from us…
