Black Mesa: Classic Edition by Yaroslav Koval aka lambdist/lambdist-bravo/Epic Samaritan/Samaritan: "Black Mesa: Classic Edition is a modified version of fan-made mod with additional features: - Classic HL1/HL2 soundtrack, remixes, mashups, hard rock covers and reimagined PS2 main theme; - Improved and HL1/HL2 Style Textures; - New and HL1/HL2/PS2 style sounds for every part of the game; - New weapon models and better weapon animations for every weapon for the 1st person experience; - Classic Hazard Course and added removed levels; - HL1 style game balance; - Improved particles; - Little improvements;" - Xen levels. - Different versions.