Reviewers Liked

  • Challenging cooperative mode extends the story
  • Excellent expansion of original concept
  • Hilarious writing, voice acting
  • Fun cooperative mode
  • Terrific writing and voice acting adds two new memorable personalities to the Portal cast
  • New environmental elements including hard light bridges and super ability gels create fresh space-time-bending twists

Reviewers Didn't Like

  • That it eventually comes to an end
  • On the short side
  • Limited post-game extras
  • Cooperative mode expansions get expensive quickly
  • No competitive play
  • Loading screens are a bit too frequent
  • No Half-Life Easter eggs this time
  • Second act is a bit aimless inbetween stages
  • New ending theme is no "Still Alive."