A Strange Mission- Forest of Doors (Regular Exit) (Speedrun?)
Savestates: NO
The nice thing about these doors is that you can enter them while in the middle of a jump. You still lose a bit of momentum upon exiting the cooresponding door, though. It'd be nice if I came out mid-jump, as that would allow for some crazy, dangerous level design. One problem I do have here is that the doors are mainly used to segment the level into major parts rather than to generate any sense of puzzlement or complexity. I mean, since the doors act like scrolling pipes in that you can see where Mario goes, I don't think it's out of the question to create something mazelike with them. In any case, the ASM in this game seems to open up more possibilities for level design, and that's a good thing.
I'm not really sure whether I can call this a speedrun, but I thought it was fast enough to merit the question, I suppose :p Enjoy!