[quote name='Wolfpup']That's one that I really WANT to try, but I think I'd stuck at and get stuck in 5 minutes. I'm usually terrible at puzzles.[/quote]
I am BY NO MEANS a proficient puzzle-solver, and I'm finding Braid difficult, but do-able. A lot of it is just goofing around, trying different things to see if any of them work, and sometimes something will just occur to me, and then I just tear right through the puzzle.
The great thing is that you can race through a level without actually solving it, so if you get really stuck on one particular puzzle, you can just move on to another level and come back later to the head-scratcher.
Right now I'm completely finished worlds 2, 3 & 4 and have partially completed worlds 5 & 6. I'm also in one of my periodic "break" periods, as I let my subconscious work out some puzzles that have got me stumped.