Hard Block

Hard blocks are normally a basic, solid terrain type, but they differ from ground blocks in a few ways:
 * They can be destroyed by a Large shell (such as that of a Koopa Troopa) or a Bob-omb explosion.
 * They can also be destroyed with a Spike Helmet.
 * Wings can be placed on them, causing them to hover side-to-side, and slightly up-and-down.
 * They can also be placed on tracks.