You can use this guy to give you unlimited health.

Also, the second grass patch of the lower five has a giant red Shyguy. In Super Mario Advance, although the grass will respawn, any coin picked up will be replaced by a vegetable while in Sub-space. In fact, since there are no other coin grabbing opportunities, you might as well exit back to map A and return again to repeat the process. You can get a potion at the entrance of map B with no trouble, but if you're looking for the glitter of gold coins, you'll have to enter Sub-space here.

Remember that in Super Mario Advance, Trouter can be your friend by giving you an assist when you need to collect A-coins that are placed low on the screen. If you're hit from the side or above by a Trouter you'll take a hit, so be careful. Trouters are common along this waterfall, and you can safely stand on their heads as the leap up, but be sure to jump off before they fall back off the screen. This stage has several gut-wrenching leaps across falling logs along the waterfall.

World 5-3 super mario bros