F0X was right!
#50: Portal 2 (PC)
The first game was very good while it lasted but it was over too quickly. Portal 2 brought back the original game's unique gameplay and improved on it with interesting additions like the different gels, light bridges, tractor beams and co-op play. It is also considerably longer and features extraordinary new characters like Wheatley, the fast-talking moronic robot and Cave Johnson, the former head of Aperture Science who has very unique views on life and science. The writing is really funny throughout and really enhances the experience as you try to solve the puzzles before you.
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