Stone block

Stone Blocks are basically grey stone blocks that appears during the events in Paper Mario. Around these various places, there is a Stone Block; always blocking Mario's way. There are also recently found in Dry Dry Ruins as these blocks can't be pushed or be bust to bits by Bombette. The only to break them completely is when Mario obtains a Super Hammer from Dry Dry Ruins. Stone Blocks sometimes contains enemies like a Stone Chomp as seen in Dry Dry Ruins.

In Paper Mario: The Thousand-Year Door, an Ultra Hammer is required to break Stone Blocks. However, the Ultra Hammer appears late in the game, and is needed to smash only a handful of Stone Blocks.