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Portal 2 Hints
How do excursion funnels work?
1 of 4: They're directed energy corridors that will slowly push whatever is placed into them from the insertion point to the end of the funnel.
2 of 4: It's easy to push an item or yourself into an excursion funnel at any point.
3 of 4: Once inside, you can exit it by pushing your way through it again. However, you can't go against its direction of flow, and you can't move yourself along the direction of flow any slower or faster.
4 of 4: As with light bridges, you can use portals to extend an excursion funnel that ends at a portal-friendly surface.
