They were as close to the original as they could reasonably be with this release. Crunched screen, but they let you backtrack a bit in the stages as a tradeoff. They let you accelerate much faster in order to allow the player to make decisions on such a small screen.

Includes SMB Lost Levels as well if you get 300k score at least and beat the main game. Includes mid-game saving (erases your high score on continue) and ultimately is a significantly more casual experience, a good pick up and play choice considering how easy it is to beat a level or two in one brief sitting.

Challenge mode lets you play score attack on each stage individually to reach listed target scores, with hidden red coins and a yoshi egg as additional goals and adds a lot of replay value for SMB super fans, wish they had those in the original title. Honestly its an improvement in every way other than the fact that they had to crunch it on the tiny screen.

I really enjoyed it.