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this is pretty unfinished, so it is hard for me to rate

Yeah the only purpose of the funnel reversing is to get the cube.

Also,I can't see why you need to reverse the funnel polarity? Once I used it to get the cube I didn't need it again.
I portaled onto the light bridge from the floor in the last room and didn't need the funnel to push me up to it.
One more idea, put a timer on the last switch so you need to get out of the tunnel with the the cube before the funnel reactivates and pushes you back in.

Good plan. I will do that right now.

Swapping the cubes over would be a good idea. Put the laser redirection cube where the normal weighted cube is and vice versa. Then you NEED the weighted cube to get the ball to turn off the laser field and get the laser redirection cube.

Once i get done with the new tf2 update.

Ok! Thanks. I'll fix that now.

here is your problem, http://www.youtube.com/watch?v=KPhOf1cwWMw&feature=youtu.be

what do you mean, "Use jumpad to get the cube"? More specific please.

fail, u can skip a lot of components
use jumpad to get the cube and door open