IN BASE FOUR!"
One minor character in this game series has twelve secret rooms known as his namesake "Dens." Another character in this series says, "two plus two is. . . ten. IN BASE FOUR!" and shoots rockets at the player during a boss fight. Emancipation Grills and Aerial Faith Plates are a part of this series, which also has the main character use Repulsion, Propulsion, and Conversion Gel to solve puzzles while audio recordings of Cave Johnson play in the background. For 10 points, name this Valve game franchise where you fight GLaDOS while playing as Chell with a gun that shoots the namesake teleportation objects.
One minor character in this game series has twelve secret rooms known as his namesake "Dens."
the Portal series [do not accept or prompt on "Portal 2"]