Platform Block

From the Super Mario Wiki

Platform Blocks are objects that appear in New Super Mario Bros. They first start out as a single block with a face on it. Each time Mario hits the block, another Platform Block will pop out above the previous one, creating up to four Platform Blocks piled on one another. This helps Mario reach high platforms that are impossible to reach by normally jumping. However, if Mario takes too long, the blocks will collapse back into a single Platform Block.

Blocks

! Block | ? Block | ♪ Block | 4-Bros. Random Block | 99 Block | Arrow Block | Attack Piece Block | Aurora Block | Black Block | Blue Coin Block | Blue Shake King Block | Bomb Block | Bonfire Block | Bonus Block | Boost Block | Brick Block | Bros. Block | Coin Block | Command Block | Control Block | Dice Block | Dotted Line Block | Drop Block | Egg Block | Event Block | Expansion Block | Face Block | Giant ? Block | Giant ! Block | Glow Block | Grab Block | Green Block | Grey Brick Block | Hidden Block | Hint Block | Ice Block | L Block | Laser Block | M Block | Marshmallow Block | Metal Block | Minus Block | Mushroom Block | Pink Block | Platform Block | Plus Block | POW Block | Propeller Block | Pushing Block | Rally Block | Random Block | Recovery Block | Red Block | Red Shake King Block | Rock Block | Save Block | Shine Block | Simu-Block | Slow Block | Snake Block | Snowman Block | Speed Block | Spin Block | Star Block | Stone Block | Super Block | Triangular Block | Turning Block | Uncertain Block | Used Block | Vanishing Block | Warp Block | Watermelon Block | White Smile Block | Wooden Block | Yellow Block | Yoshi Block