Fact Sphere
Aperture Science door
The Factual Core
Alternate names Fact Core, Factual Core,

Factual Sphere, Craig

Gender Male
Appearances Portal 2
Voiced by Nolan North
Race Artificial Intelligence
Roles Corrupted Core, Personality Sphere
Diamonds are made when coal is put under intense pressure. Diamonds put under intense pressure become foam pellets, commonly used today as packing material.
— Fact Sphere • Portal 2

The Fact Sphere is a Personality Construct that appears in the single-player campaign of Portal 2. It is one of the three cores to be attached to Wheatley in order to initiate a core transfer.

The Fact Sphere blurts out a series of random facts, some true, some false, and some just downright illogical. It holds itself in a high view, complimenting itself ("The Fact Sphere is a good person, with many friends.") while dismissing the other personality cores. ("The Adventure Sphere is a blowhard and a coward.")



  • The Fact Sphere is voiced by Nolan North, along with all of the other corrupted cores.