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The Orange Box: Portal Hints
Stationary Platform
1 of 4: Just past the big pipe is a stationary platform in a corner.
2 of 4: The moving platform will go underneath the stationary platform, knocking you off if you're still on it.
3 of 4: To avoid that, jump onto the stationary platform when you get near it.
4 of 4: Then walk back onto the moving platform as it moves out from under the stationary platform.
