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I bought it so that I could play Portal, but when the game originally came out it was just considered an add-on to the other games in The Orange Box, so I'm wondering why other people bought it.
I played Half Life on PS2 which was dated at the time and absolutely had to play HF2 and its expansions on PS3,(Orange Box) which again was already dated on PS3 but the campaigns were great.And still are.
All hail Gordon Freeman