Hi, it is slightly different but i have found it rather easy to adapt too. It�s more the other DS games i have found hard, such as pac man and trauma centre.
The DS version does keep to the super Nintendo version of the game with the odd difference like Mario can really enlarge etc�.. i am only on world 3 - so who knows. Some levels are really easy and some hard - i am finding the hidden bits the challenging bit. i am also worried that the game isn�t as long as the original - but i could be wrong.
I also have Mario karts and have to say that is really easy and very like the original but too easy.