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

Have you seen everything Aperture Science has to offer?

Refuse to solve Wheatley%26rsquo;s first test

Smash Wheatley%26rsquo;s monitors

Co-op cameo in the single player

Nursery turrets

Take Wheatley%26rsquo;s escape advice

Nolan North is truly everywhere

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