And I noticed something I didn't remember: A lot of the Fun/Tricky levels are significantly more restricted in terms of skills than on the PC version. It's most noticable on Tricky 4, Tricky 5 and Tricky 12, but there's also some other things like the lack of floaters in Fun 14. Then there's also the *very* challenging for their places Fun 22 and Tricky 14. I've heard quite a lot of comments about Mayhem being too easy in SMS, but until replaying now I've never noticed or heard that Fun and Tricky are quite a bit harder than in other versions.
...I still think though that they could've done so much more with Taxing 15 than simply a 20 of everything, though...