64. Portal
Portal is an amazing game, and has one of my favorite characters; GlaDOS. The ending had a great boss fight, but once you defeated GlaDOS the facility blows up and you are left on the outside with really no explanation of what happens to you or which year Chell is in. Is Chell dead? What happens to her? None of these questions are answered; we are just greeted by song that is sung by GlaDOS.
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