Portal 2 Easter egg guide: 30 secrets and references you may have missed

Have you seen everything Aperture Science has to offer?

Rat Man Den #4

Rat Man Den #5

Rat Man Den #6 (with miniature turret orchestra)

Rat Man Den #7 (with hidden developer commentary)

Take GLaDOS%26rsquo; escape advice

The Oracle Turret

Stand in the scanner