Walking in mid-air:
Note: This trick works best with a controller with an auto-fire feature. Get a Gold Hammer and approach the edge of a platform. Use the auto-fire to begin swinging the hammer and slowly move off the platform. Keep the D-pad pressed in that direction to swing while walking in mid-air.

Hint: Super Hammer:
Hit the bombs in level 6 in the following order to get a super hammer that breaks bricks quicker: lower right, lower left, top left.