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Half-Life 2: Episode One Hints
Section 3: Soldiers and Energy Bridges (ep1_citadel_02)
1 of 11: Moving along, you'll come to a Combine recharger on your left, and then a small platform with red and green lights in a huge room.
3 of 11: After they're all dead, enable the next energy bridge exactly the same way you did before. (In this case, you may need to fire orbs into both generators.)
4 of 11: Then take down the soldiers at the other end of the second bridge pretty much the exact same way you did the previous ones. (Watch out for one or two appearing at the edge of a higher floor.)
5 of 11: After going back and visiting the Combine recharger to heal up again, enable the third and last energy bridge in the series by firing energy orbs into both of its power generator machines.
8 of 11: In the large open area past that, turn left and jump the small gap in the walkway.
9 of 11: Run forward to the wall ahead to take cover. There'll be a soldier on a balcony who you can't easily reach with your gravity gun, so wait for him to run off or get killed by Alyx.
10 of 11: After the soldier and a messed-up dropship are gone, move along the ledge walkway until you find a side room with a door that Alyx can open.