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PAIN

How to beat: kill all three turrets. hit a button on the wall that is on the opposite side of the starting door. Use crouch fly to go onto the light bridge to the maze. Make sure to grab a cube as well. Find a cube plate in the maze. Go up the tractor beam and into the final room. Put a portal there. Grab your cube on the plate. Go back to the final area using concrete on the top floor of the maze. Make a fling to the plate in the final room with the cube. Win.

Not very hard I beat it.