What? I think SMB3 is probably the easiest of Mario games. I'll help you beat it now. The first two worlds are easy. By then you should have a P-Wing or two and a couple whistles if I remember correctly. You'll also have some cloud thing which will help you skip a stage which I found very helpful later on. Now that you're in world three, warp to world 5 I think, play the first few stages that are easy and just get some points and extra lives. Then warp to world 7 and same thing. Play some stages and use the third whistle to warp to world 8. I can't remember offhand where the third whistle is but if I played it again, I'd know right away.
You can check anywhere online for that info. I forget the order of things in world 8 but the first ship is fairly easy. The second is a little harder but you can use your P-Wing to fly over the ship. Another P-Wing can be used for one of the levels that I always found difficult. And then I used the cloud thing to skip one of the castles which I hated. Finally you get to Bowser's castle after another ship which now that I think of it is where I used the P-Wing and not the earlier ship. When in Bowser's castle, it's sort of confusing but try to get towards the top when moving along. It takes you to Bowser quicker.
I'm not sure the exact order of things since it's been a while since I played.
I'll come up with something better eventually...
