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Map: sp_a3_03.bsp Title: Cave Johnson
This is the thirty-seventh level of the game, and takes place within the dilapidated Aperture Science Enrichment Center, as well as Pump Station Alpha. This level features Goo as its main hazard, and also reveals some of the history behind Aperture Science. This level also introduces two new characters through the use of pre-recorded voice messages; Cave Johnson and Caroline.