Quote from ChickenMobile on October 14, 2012, 3:27 am

Since Valve has fixed the HDR displacement bug, I am going to upload a revisited version to fix bugs and make the puzzle easier for people who had trouble painting the speed ramp.

V 2.0
- Compiled with HDR
- Fixed general overlapping textures
- Added clip above fence so you can't skip the whole map
- Edited main puzzle so it is much easier to paint ramp
- Chamber is physically changed with gravity well moved as well as walls and the ramps
- The cube now lands closer to edge of ramp
- Added clip on handrails which previously could walk through
- Added clip on rails to avoid getting stuck (stairs)