Black Mesa Official Trailer

Need I say more? Well for those not in the know: Black Mesa (formerly Black Mesa: Source) is a Half-Life 2 total conversion remaking VALVe Software's award-winning PC game, Half-Life. Utilizing the Source engine, Black Mesa will reintroduce the player as Doctor Gordon Freeman, along with the original cast of memorable characters and environments seen in Half-Life. This total conversion will not require Half-Life: Source to play - only a copy of any Source Engine game installed on Steam. [Source: Black Mesa]