The Jonster said:
To finish my earlier talk about Rayman Junior...
Compared with the rest of the levels from Rayman Junior, Art Alley is painfully slow to me, and it's really too bad the the programmers decided not to include the running ability in this game (i think), since I tend to be able to get all of the answers pretty quickly. What I also find curious is that each level of difficulty (1, 2, 3) alters some of the levels a little, and not just the answers.
The running ability is "in the game", since Mister Dark forces Rayman to use it in the last level, but it's not enabled other than that though, which is indeed frustrating. I think it's good that the levels are altered. Shows they were creative! Also if the structures were too similar then veterans of a lower difficulty level would just be able to guess the answers on the next one.

Another interesting thing is that on the highest difficulty level, hitzones of enemies are expanded to the full extent of the sprites. It means you can kill antitoons without ducking, but it also means that you can be stung by a prickly ball without appearing to even touch it.