Endgame (Black Mesa)
Endgame is the nineteenth and final chapter of 
 Black Mesa. Here, Gordon Freeman is confronted by the G-Man. Both are transported to various locales around Xen while the G-Man praises Gordon's actions there. He explains that his "employers" are now in control of the borderworld for the time being and have authorized him to offer Gordon a job, agreeing that he has "limitless potential".
The final teleportation places them inside a tram identical to the one Gordon rode on at the beginning of the game that is flying through space at immense speed. Gordon accepts this offer by stepping through a portal and hears the G-Man's voice one last time: "Wisely done, Mr. Freeman, I will see you up ahead."
Alternatively, the player may choose not to step into the portal in the final scene. This causes Gordon to be teleported into a giant cave facing rows of Alien Grunts and Alien Crafts as the game ends with the G-Man's comment, "Well, it looks like we won't be working together. No regrets, Mr. Freeman."
Maps
The following .bsp comprises this chapter.
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  Black Mesa Inboundbm_c0a0a   | 
  Anomalous Materialsbm_c1a0a   | 
  Unforeseen Consequencesbm_c1a1a   | 
  Office Complexbm_c1a2a   | 
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  "We've Got Hostiles!"bm_c1a3a   | 
  Blast Pitbm_c1a4a   | 
  Power Upbm_c2a1a   | 
  On a Railbm_c2a2a   | 
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  Apprehensionbm_c2a3a   | 
  Residue Processingbm_c2a4a   | 
  Questionable Ethicsbm_c2a4e   | 
  Surface Tensionbm_c2a5a   | 
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  "Forget About Freeman!"bm_c3a1a   | 
  Lambda Corebm_c3a2a   | 
  Xenbm_c4a1a   | 
  Gonarch's Lairbm_c4a2a   | 
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  Interloperbm_c4a3a   | 
  Nihilanthbm_c4a4a   | 
  Endgamebm_c5a1a   | 
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