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Portal 2 Hints
Alpha Enrichment Sphere #2
1 of 5: The walkway is broken ahead, so drop down from the end of it to the floor below.
2 of 5: Look for some bent metal beams that form a sort of bridge across the toxic lake, then use them to get to another floor.
3 of 5: Looking up from that floor, you'll see this sphere's test chamber way above you.