 Chell proceeds through the empty Enrichment Center, with GLaDOS as her only interaction.As the player nears completion, GLaDOS's motives and behavior turn more sinister; although she is designed to appear encouraging, GLaDOS's actions and speech suggest insincerity and callous disregard for the safety and well-being of the test subjects.The test chambers become increasingly dangerous as Chell proceeds, tests including a live-fire course designed for military androids, as well as some chambers flooded with a hazardous liquid.