prePostscript is a mini mod based on the original Portal 2: Conversion idea made by the same original creator. It's a 2-3 hour long story-driven experience which focuses more on explaining what happened in-between Portal 1 and Portal 2 events. Aperture Science is left in ruins. SHE is dead. Will you be able to save hundreds of test subjects waiting their turn to be a lab rat? Be quick in making choices, the Core is melting down, we don't have much time before the complete annihilation!