I think you remember that MS-DOS Mario game made in 1994.
Well, this game I have here will include the six original levels plus a level editor to create and share levels.
If you want to give the game a try, here's an engine test of it.
The controls are CONTROL / Z
for running / shoot fireballs, SHIFT / X
for jumping and Arrows
for moving (You can't duck on this game, sorry :3)
C+C will be appreciated.