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Butter Bridge

It hasn't been an easy task but I think I managed to build an interesting test chamber using funnel and light bridge... And buttons but that's not the point!
Even though it doesn't match the imagination of my friends whom have mastered the art of testing, I'm fairly confident that I come up with something original and fun.

By the way, you might find a strange invisible (but tiny) wall that blocks cubes somewhere in the map, I won't tell you where it is! Feel free to look for it!
If you find it:

1) I don't know how that happened;
2) It doesn't have ANYTHING to do with the intended solution;
3) I doubt you'll make profit from it;
4) Feel free to laugh and joke about it. It's Wheatley's fault anyway;

Why did I call it "Butter Bridge", you ask?
Because it's the name of a level in 'Super Mario World' (SNES, 1990) and I love this game that made a my childhood! :D

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UPDATE (12/19/2016): Fixed jumping inside funnel, added a cube button to exit door. Thanks to Nockscitney and GamerXD54 for feedback.