***SPOILERS*** READ IF YOU HAVE FINISHED THE GAME
The following discussion will contain spoilers.
Why is the game so short? It took me 3.1 hours to complete it. That's only 186 minutes. I did it over 3 days.
Okay, so I may have an advantage because I've clocked Portal 2 and I've clocked its co-op (with a friend), and also I haven't done any of the bonus levels, but I didn't use any cheats or walkthroughs when playing this one. I think I did really good at this game, but I'm not really a pro. I was really surprised when I got into the boss fight with Glados after such short time of playing this game.
Did anyone take SIGNIFICANTLY longer or shorter than 3.1 hours? Anyone know why the game was so short?