Return to Aperture Science, overrun by a rogue Combine AI with little patience and murderous intent. Solve puzzles that will challenge your three-dimensional thinking, and step through the Portal into a wholly different testing facility.
An observation room in for Triumph as thanks for getting it into the top 100! Don't forget to vote for us in the Best Upcoming category!
Is that a different stalker model than the one you had on the RTBR page awhile back?