Half-Life's gameplay elements were integrated with the mood of the game, creating memorable set pieces like the opening tram ride and elevator sequence. The game innovated boss fights by having the "boss" permeate a level rather than just popping up at the end. However, this also led to anticlimactic conclusions when confronting bosses, which often felt more like puzzle-solving than actual combat. Overall, Half-Life is still considered one of the best single-player FPS games, and its influence can be seen in many other games that followed in its footsteps.