And yet I put in temporary clips and little trigger_pushes to keep the cube centered with as minimal effort as possible :P That said, the odds of failing twice should be fairly slim.

Ironically, I'm working on another puzzle where I have to do some physics tweaking in Hammer to get the cubes to behave. Good news is that this case is a fair bit milder than the last one.

You may have already seen the puzzle in my workshop. I call it Puzzle on Rails , which they always told me never to create ;)