Operation Lambda

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Hello, and welcome to the Operation Lambda website!

Feel free to browse around, or head over to our forums for some mod related discussion. We have a growing community, and we would appreciate the support you would give us by signing up there.

You can find out more about what Operation Lambda aims to achieve by heading over to our about page.

Thank you!
Operation Lambda Developers.

Operation Lambda is a Source Engine total conversion modification, set during and after the events of Half-Life 1.

You play Doctor West, a scientist from the Lambda Complex who disappears during the catastrophic resonance cascade.

Stranded on the Combine Homeworld, you have to navigate your way back to earth, in order to discover the truth.

See the destruction of Black Mesa
Experience the Combine homeworld
Live the beginning of the 7-hour war


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