Super Mario Extreme
This is another fan made 2d side scroller. It is way more challenging than many of the official games and starts hard right off the bat. Unlike in many other Mario games you get to chose between many different levels as you go. Each level has a different theme with very interesting graphics.
There are snow levels, lava levels, beach levels, prison levels, graveyard levels, mushroom levels, water levels and much more.
This is a great game if you already have completed the previous Mario games and are looking for something a bit more challenging as well as being longer. It consists of more than 40 levels!
Screenshots:
World 1:
The Lava Cave:
The Nightmare House:
The Pagode Prison:
The Spaceship:







