Minor cosmetic changes, but finally got the thumb image I wanted to appear.

Replaced more PuzzleMaker stuff with Hammer construction. Added decorations (pipes, decals, etc.).

Replaced flip-panels with Hammer func_doors, other cosmetic improvements.

Updated with Hammer to make it more visually interesting, easier in execution and less prone to accidental death. The puzzles are the same.

Made insides of doorways in blue gel room non-portalable.

Blocked unintended use of light bridge in third side room.

Failed upload.

Attempted to block unintended paths using light bridge in third side room.

Failed upload.

Minor changes to make it impossible to get out of the glass walkway at the far end, even with a bouncy frankencube, and to block the short-cut to getting the sphere with just a light bridge.