Since landing on Vines or Rotary Lifts (the spinning red and green platforms) doesn't count as touching the ground, you can stomp enemies that can recover (Dry Bones, Koopa Troopas), land on a Vine or Rotary Lift, and wait for them to recover to stomp them again.

The Vine Method - A variation of The Goomba Stomp Technique.

This works best when you are Raccoon/Tanooki Mario, in areas with endless supplies of enemies (such as Goomba-generating pipes) or where stomp-and-recover enemies (Dry Bones, Koopa Troopas) exist.

The Goomba Stomp Technique - Stomp lots of enemies in a row without touching the ground.

Grab a shell and kick it to a place where it can ricochet back and forth between two obstacles, killing the enemies for points and eventually 1-Ups.

The Shell Technique - Go to a spot where an endless number of enemies appear, such as Bullet Bills from a cannon or Spinies from Lakitu.

For example, if you hit a Question Block on the lower-right corner, the item will go to the left. If you hit a Block that contains a Super Mushroom, 1-Up Mushroom, or Starman, the item will move to the side opposite where you hit the Block. Duck, and your shell will protect you from fireballs.

Hammer Brother Suit - Press B to throw hammers! The hammers are powerful enough to kill tougher enemies like Thwomps and Boos.

Tanooki Suit - Hold B while pressing Down to turn into a statue for up to 5 game seconds.

Frog Suit - Gives Mario greater speed and control while swimming.

Super mario bros. 3 world 2-5