HL2 continued to the story of Gordon Freeman, who was freed from a state of stasis by the idiosyncratic G-Man. The most notable innovation was the debut of the gravity gun, which showed off the game's unparalleled physics engine eventually used for the company's Portal series. Not only was this the best No. 2 game to ever be developed, it it right up there as one of the best experiences in interactive entertainment. High praise, for sure, but that's to be expected for a game that had won 39 Game of the Year awards. We know what you're thinking: What a pathetic showing.

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