Metal Block

A Metal Block is a large block that appears in the Paper Mario series.

Paper Mario
In Paper Mario, large blocks can be breakable once Mario gets the Ultra Hammer from Mt. Lavalava. Metal Blocks usually lead to Super Blocks. Metal Blocks are very common throughout Mt. Lavalava.

Paper Mario: The Thousand-Year Door
In Paper Mario: The Thousand-Year Door, the Metal Blocks retain their purpose being only broken with the Ultra Hammer. One Metal Block blocks the door containing the Warp Pipe that leads to Chapter 7 (mainly  [[Fahr Outpost).