00:00Portal 2 turns 15 today.
00:02After the phenomenal success of 2007's Portal, Valve began work on a sequel immediately.
00:07Released on April 18th, 2011, Portal 2 features longer and significantly more complex puzzles.
00:13Portal 2 has a greater suite of tools to help players solve puzzles,
00:16including propulsion and repulsion gels, prisms to direct lasers and tractor beams.
00:20Ella MacLean reprises her role as GLaDOS and is joined by Stephen Merchant as Wheatley,
00:25alongside J.K. Simmons as Aperture Science CEO Cave Johnson.
00:29Portal 2 also included a popular co-op mode where you attempt to solve puzzles as two clumsy robots.
00:34What was your favourite moment of Portal 2? Let us know in the comments!
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