High Quality Content by WIKIPEDIA articles! Black Mesa (previously known as Black Mesa: Source) is a third-party total conversion modification for Valve Corporation`s Source engine. The stated goal of the project is to recreate Valve`s critically acclaimed 1998 video game Half-Life using the more advanced capabilities of the Source engine. The 40-person volunteer development team says they hope to create a more engrossing in-game world with more varied, complex environments and more challenging, realistic gameplay.