Use the Kirby's permanent frying pan glitch on some objects, and they'll never reappear until you restart the level. One good example is in the level "Mushroom Kingdom". Stand on a block and use Kirby's B attack (when it's Game and Watch's frying pan). If you break through the blocks below you and fall, then that will have activated the glitch, and those blocks will not return. You can do this repeatedly until there are no blocks left.
Submitted by: Yurka256