Fixed the level 10 issue. Now it's game complete at that point. Version 4a or 4b shouldn't get easier as levels go up, but it sounds like maybe that's the case.
CoolTapes: If you download the latest Flash player it should fix that. If you're not up for that, I did just upload a new version (1.3.0a) that might help too.
moonsanim, after saving, when you reload the game, it should ask you if you want to continue old game. If not, try right-clicking on the game, choose settings, then click the folder icon. Then make sure it's set to at least 100k. If that doesn't work, you may have security settings in your browser that prevent cookie saving
I thought maybe a very subtle sound effect when you move over the object might be nice. Kind of a light friction like the scrollbar sound in Mac OS X or something.
Thanks for the feedback. I considered the paintbrush idea, but then it becomes a game of mad scribbling instead of a puzzle. I thought instead I might offer a limited number of pins -- you click when over the object to mark those points as reference. In the end, though, I figured your supposed to be _blind_, and didn't want to belabor a pretty simple concept.
 "Difference Engine"){kind=icon}
 "Happy Pill 2 : Double Dosage"){kind=icon}
 "The Hardest Jigsaw Puzzle in the World"){kind=icon}
 "You Blind!"){kind=icon}
 "Happy Pill"){kind=icon}