"The Library" is the seventh level in the first-person shooter (FPS) video game Halo: Combat Evolved and its remake, Halo: Campaign Evolved. Taking place in an ancient Forerunner library within Installation 04, one of many ringworld megastructures created by the advanced alien race, the level involves Master Chief's attempt to activate the Installation's defenses and destroy the threat of the Flood with the assistance of the floating robot 343 Guilty Spark, while fending off the newly-awakened Flood monsters.