Portal: Prelude Complex's Visit

This is the twenty-first level of the game, and introduces the players to the laboratories of the complex.

Hazards

 * None

Trivia

 * In this level, the player enters and/or see some rooms from the original Portal, like the observation room of the Test Chamber 06 for example.

Music
14. Atmosphere 5 - 0:35 by ERH 36. The Cake is a Lie! - 3:04 by The Hamster Alliance