Yellow Block

From the Super Mario Wiki

Yellow Blocks are seen in the Paper Mario series. They serve as obstacles that can be destroyed by the basic hammer or Cudge. They serve more as an obstacle in Super Paper Mario; this is because the player does not get Cudge until Chapter 5. In the other two games, they are not very hard to get by, but there are other harder blocks that serve as more of an obstacle, the Stone Blocks and Metal Blocks.

Blocks

! Block | ? Block | ♪ Block | 4-Bros. Random Block | Arrow Block | Aurora Block | Bonus Block | Brick Block | Bros. Block | Coin Block | Command Block | Control Block | Dice Block | Dotted Line Block | Drop Block | Egg Block | Event Block | Expansion Block | Giant ? Block | Giant ! Block | Grab Block | Heart Block | Hidden Block | Hint Block | Ice Block | L Block | Laser Block | M Block | Marshmallow Block | Metal Block | Minus Block | Mushroom Block | Perry Block | Pink Block | Plus Block | POW Block | Pushing Block | Rally Block | Random Block | Rock Block | Save Block | Shine Block | Simu-Block | Spin Block | Star Block | Stone Block | Super Block | Triangular Block | Turning Block | Used Block | Warp Block | Wooden Block | Yellow Block | Yoshi Block