I'll put that in to effect so ALL puzzles will run 100% the same on ALL machines, even when they're running at 3FPS. :) Great find! Thanks!
Hurrah! :)
How about taking a poll for each of the levels, with each of us testers rating the difficulty of a level 1 (easy) to 5 (hard) ...then you can put your levels in order from easiest to hardest, based on the survey.
@Grisu, Grey Alien, and others:
...but everyone should really hold off on announcing how difficult a level is until Dustin fixes the delta timing issue. As I say above, levels he's designed to be solvable may not be solvable on your machine, depending on graphics performance.