A while back I showed you a method that you could use to get all the 1UPs you wanted in Super Mario Bros. 3 that used a bouncing shell. Fast forward a few years and the same method makes a comeback in one of the sequels.

First, make your way to Stage 4-1 called "GO! GO! MARIO!!". It's one of the few stages that actually has Koopas in it.

Then, grab a Koopa shell (they're all over the place) and make your way to this pipe formation.

Spit the shell to the left, so it bounces between the pipes. Shy Guys will keep coming out of the leftmost pipe and jumping down to meet their doom. And eventually:

1UP! Just remember: If you've got the maximum amount of Eggs, nothing will come out of the pipe, so you have to throw one (or more) away.

And, since there's no time limit, you can stay here as long as you want, racking up lives.

It is kind of annoying that you don't get to do this until about halfway through the game, but it does get pretty tough from here on in. So you're going to need all the help you can get.