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Portal 2 Hints
How can I turn the water off?
1 of 7: Notice the blue dots that lead away from the higher floor.
2 of 7: They go over to a small alcove high up in one wall that contains a button pedestal.
3 of 7: Its button will probably shut off the water, but how can you get up to where you can press it?
4 of 7: You can't use portals, so try using repulsion gel.
5 of 7: Relocate the blue portal onto the floor directly underneath the button pedestal's alcove, next to the wall.
6 of 7: After a gel glob shoots up out of it, relocate the blue portal so the gel will hit the floor when it falls.
7 of 7: You can then move up next to the wall and jump in order to get up to where you can press the button. (Note that to stop bouncing, you'll need to hold down the Duck key.)