Auditorium is a very nice relaxing Flash-based puzzle game. If you need something "for in-between", this is one for you.
QUOTE:
Auditorium is about the process of discovery and play. There are no right or wrong answers; there are many ways to solve every puzzle.
A related note: I have preordered
Crayon Physics Deluxe a while ago! If you like games based on "real" physics, check it out (there's a free flash clone called
Magic Pen).
Update Jan 9th: Crayon Physics Deluxe has been released!