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I started the first beam that shoots into the core. Gone through the small hallway with the 4 energy balls that shoot and you have to run past. Go up and into another room and defeated the combine up there and that's it. There is a door out to the core but there is a force field blocking it. There is a ledge but its too high to jump. There is also some sort of enegry beem running from floor to top. Please help, its going on 2 days and its driving me crazy ;(