Blockhopper

Blockhoppers (also known as Coin Impostor) are robotic enemies encountered in the game New Super Mario Bros.. They are found only on World 2. They disguise themselves as a ? Block, with Brick Blocks on top of them, but once Mario approaches, they reveal their true form. They are actually blue robot-like enemies, and will hop at Mario in cue with the background music. They can be told apart from ? Blocks by the fact that the question mark on them does not move. They are similar to the Pile Driver Micro-Goombas that disguise themselves as blocks from Super Mario Bros. 3. They can be defeated with either a thrown Koopa's shell or a Ground Pound from above. The player will get a coin or an item if they ground pound the ? Block on the Blockhopper.

The Blockhopper's eyes and feet are very sinilar to those of MC Ballyhoo, host of Mario Party 8, meaning he might be of the same or similar species.