Step back through the portal or run though the displacement barrier towards the - now open - exit.
First Published: 30-06-2011 / 00:00 GMT
Last Updated: 10-09-2020 / 02:15 GMT
Version: 1.0 (????) 20-09-2020 / 19:50 GMT
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Welcome back to Aperture Science, a world where your Companion Cube isn't you're only company. Take control of Chell once again in Valve's sequel which takes you on an humorous and puzzling adventure and in our detail-packed guide we'll show you:
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