Block Devil

Block Devil is the boss of the third Wily Castle stage in Mega Man 10. He is part of the Devil series of robots.

Attacks
The Block Devil attacks by making some of the blocks from the floors and walls come together. Then the eye comes from below the screen to enter into the blocks and shoots plasma balls. After this the blocks go back to their original spots. The eye appears below the floor and makes all the blocks that were used attack by jumping out of their spots, and restart its attack pattern. The higher the difficulty setting, the faster the Block Devil will go through this pattern.

The Block Devil is weak to the Rebound Striker, though the Thunder Wool is also effective at dealing damage. The Triple Blade's downward-shooting ability while Mega Man is jumping or the Wheel Cutter (if timed correctly) can be used to hit the eye when it appears on the bottom of the screen, out of reach of other weapons.

Trivia
The Block Devil may be a combination of Yellow Devil and the Picopico-Master from Mega Man 2.