Hollow Bastion, first time, KH1. From losing your team mates right through to Sora's sacrifice it's tense, intense and brilliant designed. Best map, and best use of music in the game throughout the sequence too.
This
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http://i498.photobucket.com/albums/rr345/Rakaputra/pjbasis.png
SuperNiceDog - 1, pjbasis - 0