A new series of videos called Exposure will show off the mechanics involved in the Portal prequel that never saw the light of day.
Welcomed by her new boss Jade Raymond.
One of the most creative puzzle games recreated creatively.
J.J. Abrams hopes to announce something new "fairly soon".
Stories for both are still being developed.
Valve News Network takes an in-depth look at the many twists and turns of Portal's development.
Steam is giving away the original game
More clues found in Sunday's patch
Is the patch a lie?